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- Fix declaration of _zope_interface_coptimizations, it's not a top level
package.
- Add a DocTestSuite for odd.py module, so their tests are run.
- Allow to bootstrap on Jython.
- Fix https://bugs.launchpad.net/zope3/3.3/+bug/98388: ISpecification
was missing a declaration for __iro__.
- Add optional code optimizations support, which allows the building
of C code optimizations to fail (Jython).
- Replace `_flatten` with a non-recursive implementation, effectively making
it 3x faster.