Change Log
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     Version 1.35
	  Todd Showalter discovered that the number of free cells reported 
	  after GC was incorrect, which could also cause unnecessary allocations.
	 Version 1.34
	  Long missing version. Lots of bugfixes have accumulated in my email, so
	  I had to start using them. In this version, Keenan Pepper has submitted
	  a bugfix for the string comparison library procedure, Wouter Boeke 
	  modified some code that was casting to the wrong type and crashed on
	  some machines, "SheppardCo" submitted a replacement "modulo" code and
	  Scott Fenton submitted lots of corrections that shut up some compiler
	  warnings. Brian Maher submitted instructions on how to build on OS-X.
	  I have to dig deeper into my mailbox and find earlier emails, too.
     Version 1.33
	  Charles Hayden fixed a nasty GC bug of the new stack frame, while in
	  the process of porting TinyScheme to C++. He also submitted other 
	  changes, and other people also had comments or requests, but the GC
	  bug was so important that this version is put through the door to 
	  correct it.
     Version 1.32
	  Stephen Gildea put some quality time on TinyScheme again, and made
	  a whole lot of changes to the interpreter that made it noticeably 
	  faster.
     Version 1.31
          Patches to the hastily-done version 1.30. Stephen Gildea fixed
	  some things done wrongly, and Richard Russo fixed the makefile
	  for building on Windows. Property lists (heritage from MiniScheme)
	  are now optional and have dissappeared from the interface. They
	  should be considered as deprecated.
     Version 1.30
	  After many months, I followed Preston Bannister's advice of
	  using macros and a single source text to keep the enums and the
	  dispatch table in sync, and I used his contributed "opdefines.h".
	  Timothy Downs contributed a helpful function, "scheme_call".
	  Stephen Gildea contributed new versions of the makefile and 
	  practically all other sources. He created a built-in STRING-APPEND,
	  and fixed a lot of other bugs.
	  Ruhi Bloodworth reported fixes necessary for OS X and a small
	  bug in dynload.c.
     Version 1.29
	  The previous version contained a lot of corrections, but there
	  were a lot more that still wait on a sheet of paper lost in a
	  carton someplace after my house move... Manuel Heras-Gilsanz
	  noticed this and resent his own contribution, which relies on
	  another bugfix that v.1.28 was missing: a problem with string
	  output, that this version fixes. I hope other people will take
	  the time to resend their contributions, if they didn't make it
	  to v.1.28.
     Version 1.28
	  Many people have contacted me with bugfixes or remarks in
	  the three months I was inactive. A lot of them spotted that 
	  scheme_deinit crashed while reporting gc results. They suggested
	  that sc->outport be set to NIL in scheme_deinit, which I did.
	  Dennis Taylor remarked that OP_VALUEPRINT reset sc->value instead
	  of preserving it. He submitted a modification which I adopted 
	  partially. David Hovemeyer sent me many little changes, that you
	  will find in version 1.28, and Partice Stoessel modified the 
	  float reader to conform to R5RS.
     Version 1.27
          Version 1.27 is the successor of 1.25. Bug fixes only, but I had to
          release them so that everybody can profit. 'Backchar' tried to write
          back to the string, which obviously didn't work for const strings.
          'Substring' didn't check for crossed start and end indices. Defines
          changed to restore the ability to compile under MSVC.
     Version 1.26
          Version 1.26 was never released. I changed a lot of things, in fact
          too much, even the garbage collector, and hell broke loose. I'll
          try a more gradual approach next time.
     Version 1.25
          Types have been homogenized to be able to accomodate a different
	  representation. Plus, promises are no longer closures. Unfortunately,
	  I discovered that continuations and force/delay do not pass the SCM
	  test (and never did)... However, on the bright side, what little
	  modifications I did had a large impact on the footprint: 
	  USE_NO_FEATURES now produces an object file of 63960 bytes on Linux!
     Version 1.24
	  SCM tests now pass again after change in atom2str.
     Version 1.23
          Finally I managed to mess it up with my version control. Version
	  1.22 actually lacked some of the things I have been fixing in the
	  meantime. This should be considered as a complete replacement for
	  1.22.
     Version 1.22
          The new ports had a bug in LOAD. MK_CLOSURE is introduced.
	  Shawn Wagner inquired about string->number and number->string.
	  I added string->atom and atom->string and defined the number
	  functions from them. Doing that, I fixed WRITE applied to symbols
	  (it didn't quote them). Unfortunately, minimum build is now
	  slightly larger than 64k... I postpone action because Jason's idea
	  might solve it elegantly.
     Version 1.21
          Jason Felice submitted a radically different datatype representation
	  which he had implemented. While discussing its pros and cons, it
	  became apparent that the current implementation of ports suffered
	  from a grave fault: ports were not garbage-collected. I changed the
	  ports to be heap-allocated, which enabled the use of string ports
	  for loading. Jason also fixed errors in the garbage collection of 
	  vectors. USE_VERBATIM is gone. "ssp_compiler.c" has a better solution
	  on HTML generation. A bug involving backslash notation in strings
	  has been fixed. '-c' flag now executes next argument as a stream of
	  Scheme commands. Foreign functions are now also heap allocated,
          and scheme_define is used to define everything.
     Version 1.20
          Tracing has been added. The toplevel loop has been slightly
	  rearranged. Backquote reading for vector templates has been
	  sanitized. Symbol interning is now correct. Arithmetic functions
	  have been corrected. APPLY, MAP, FOR-EACH, numeric comparison
	  functions fixed. String reader/writer understands \xAA notation.
     Version 1.19
          Carriage Return now delimits identifiers. DOS-formatted Scheme files
          can be used by Unix. Random number generator added to library.
          Fixed some glitches of the new type-checking scheme. Fixed erroneous
          (append '() 'a) behavior. Will continue with r4rstest.scm to
          fix errors.
     Version 1.18
          The FFI has been extended. USE_VERBOSE_GC has gone. Anyone wanting
          the same functionality can put (gcverbose #t) in init.scm.
          print-width was removed, along with three corresponding op-codes.
     	  Extended character constants with ASCII names were added.
          mk_counted_string paves the way for full support of binary strings.
          As much as possible of the type-checking chores were delegated
          to the inner loop, thus reducing the code size to less than 4200 loc!
     Version 1.17
          Dynamically-loaded extensions are more fully integrated.
          TinyScheme is now distributed under the BSD open-source license.
     Version 1.16
          Dynamically-loaded extensions introduced (USE_DL).
          Santeri Paavolainen found a race condition: When a cons is executed,
          and each of the two arguments is a constructing function,  GC could
          happen before all arguments are evaluated and cons() is called, and
          the evaluated arguments would all be reclaimed!
          Fortunately, such a case was rare in the code, although it is
          a pitfall in new code and code in foreign functions. Currently, only
          one such case remains, when COLON_HOOK is defined.
     Version 1.15
          David Gould also contributed some changes that speed up operation.
          Kirk Zurell fixed HASPROP.
          The Garbage Collection didn't collect all the garbage...fixed.
     Version 1.14
          Unfortunately, after Andre fixed the GC it became obvious that the
          algorithm was too slow... Fortunately, David Gould found a way to
          speed it up.
     Version 1.13
          Silly bug involving division by zero resolved by Roland Kaufman.
          Macintoch support from Shmulik Regev.
          Float parser bug fixed by Alexander Shendi.
          GC bug from Andru Luvisi.
     Version 1.12
          Cis* incorrectly called isalpha() instead of isascii()
          Added USE_CHAR_CLASSIFIERS, USE_STRING_PORTS.
     Version 1.11
          BSDI defines isnumber... changed all similar functions to is_*
          EXPT now has correct definition. Added FLOOR,CEILING,TRUNCATE
          and ROUND, courtesy of Bengt Kleberg. Preprocessor symbols now
          have values 1 or 0, and can be set as compiler defines (proposed
          by Andy Ganor *months* ago). 'prompt' and 'InitFile' can now be
          defined during compilation, too.
     Version 1.10
          Another bug when file ends with comment!
          Added DEFINE-MACRO in init.scm, courtesy of Andy Gaynor.
     Version 1.09
          Removed bug when READ met EOF. lcm.
     Version 1.08
          quotient,remainder and modulo. gcd.
     Version 1.07
          '=>' in cond now exists
          list? now checks for circularity
          some reader bugs removed
          Reader is more consistent wrt vectors
          Quote and Quasiquote work with vectors
     Version 1.06
          #! is now skipped
          generic-assoc bug removed
          strings are now managed differently, hack.txt is removed
          various delicate points fixed
     Version 1.05
          Support for scripts, *args*, "-1" option.
          Various R5RS procedures.
          *sharp-hook*
          Handles unmatched parentheses.
          New architecture for procedures.
     Version 1.04
          Added missing T_ATOM bits...
          Added vectors
          Free-list is sorted by address, since vectors need consecutive cells.
          (quit <exitcode>) for use with scripts
     Version 1.03 (26 Aug 1998):
          Extended .h with useful functions for FFI
          Library: with-input-* etc.
          Finished R5RS I/O, added string ports.
     Version 1.02 (25 Aug 1998):
          First part of R5RS I/O.