[jhc] darcs patch: turn on the garbage collector by default (and 1 more)

Sat Jan 29 18:25:13 PST 2011 John Meacham <john@repetae.net> * turn on the garbage collector by default Sat Jan 29 19:06:57 PST 2011 John Meacham <john@repetae.net> * unbox returning applications, can normalize many lets in grin