This commit is the result of many days of picking vm apart and putting
it back together again. The result is an implementation which separates
compile and runtime into separate steps, and which functions (more)
correctly in the face of recursion.
Pretty much all aspects of vm have been modified or deleted, so it's not
even really worth it to describe specific changes. Just pretend this is
the original implementaiton and the old one was never done.
Brian Picciano
2be865181d