Update a bunch of newer code to be compatible with Python 3.
Since I initially went through and ported our code to Python 3, we've written a

bunch of new stuff. A lot of this stuff, especially the stuff that was done

initially on the release-1.7.x branch, didn't use the newer conventions for 2/3

compatibility. There were also a few lingering things that I hadn't ported yet

(like the execfile() call in rb-site).

Ran unit tests.