vm merged to master

[Andy Wingo]

Hey all,

I went ahead and merged VM to master. Things went fine after a couple of
manual merges, though `(procedure-property apply 'arity)' needs some
work -- see the log for 5442b3a5989a118f2addf3190eab2e27d65e0658.

I should be happy but really I'm just tired ;) Can people please check
this out, give it some pounding and report any errors to the list.

Errors running external code modules are especially appreciated --
existing code should still work, with very few exceptions.

Andy
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