Whoops. register specialiced int functions correctly

Type specialice buildin math support

add listAppendArrayInternal which appends an array of elements to a list

Except for the few that were actually working, which became
normal tests again.

Implement string.split(sep)

TraceStack: when visiting a range preallocate the elements.

Fix wrong if check: causing allocs smaller than 16byte to end up in the 32byte bucket

Improves performance of raytrace.py from about 10secs to 7secs.

Doing it "right" is more complicated than I thought,
so it's a little bit hacky right now.

Specify that lzma needs to be installed (doesn't really, but to keep things simple), and try to support running pyston not from src/

fix several minor issues found during installing and building