tcs: tune changes, add mime aliases
 [rsc] --rw-rw-r-- M 76409 rsc sys 6283 Mar 30 08:01 sys/src/cmd/tcs/tune.c
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0330/plan9/sys/src/cmd/tcs/tune.c /n/sourcesdump/2006/0331/plan9/sys/src/cmd/tcs/tune.c]
 [rsc] --rw-rw-r-- M 76409 glenda sys 19206 Mar 30 08:59 sys/src/cmd/tcs/tcs.c
	[diffs elided - too long]
	[diff -c /n/sourcesdump/2006/0330/plan9/sys/src/cmd/tcs/tcs.c /n/sourcesdump/2006/0331/plan9/sys/src/cmd/tcs/tcs.c]