Simplification expands match expanders and removes syntactic sugar.
Also, syntax errors are checked in the simplification phase, so better
error messages can be given.
Remove pointless optional arguments in getbindings.
Don't create unneccessary match-lambda*.
Implement keyword arguments to define-match-expander.
Lots of refactoring of gen-match for general clarity.
Use combinators instead of writing our own loops.
Simplify struct info accessor.
Add timing printer.
Refactor coupling/binding for general clarity.
Rewrite logical-equal not to use the expansion of match.
General replacement of () with [].
svn: r4192
