[stack] Scheme to Cat compiler

I've written a simple compiler from Scheme to Cat in Scheme for a
course and posted it, along with an extremely rushed technical report,
at: http://www.cat-language.com/2cat.zip. Unfortunately it only works
on Gambit Scheme. I tried making it R5 compliant, but I couldn't
figure out how long it would take. I felt like I was programming
Pascal on Dos, because I would only get one error message at a time! I
hope someone will care enough to make it R5 complaint and share it
back with the community.

Anyway, in summary the compiler is relatively simple, and the only
thing a little out of the ordinary is the optimizer, which is a
partial evaluator based on rewriting rules.

Have fun,
Christopher Diggins