Node sizes

Fix p3 32bit

up.

force persistent and interface eggs in test and interpreter scripts

version # when we're ready to release.

Untested. I'll let travis take the first crack. Man, I need to
figure out tox.

Also, I'm not happy with the config variable names I originally
picked.  I'll fix those after the tests pass.

to make them work on mac.

We have to check both TypeError and OverflowError. On Python3 32-bit,
we'll get an OverflowError, otherwise, we get type error.

  under Python 3.

slots and instance dicts correctly.)

  control maximum sizes for bucket and tree nodes.

Make the Python trees and sets accept an explicit None argument to indicate an open range in keys(), values() and min/maxKey(), as per the interface documentation and the C implementation. Except actually, the C implementation didn't accept a None for mim/maxKey, so make it actually do that.

Items must be in reversed-sorted order.

Fixes #2 (maybe).