Problem:    Python: slices with steps are not supported.
Solution:   Support slices in Python vim.List. (ZyX)

Problem:    Python: When vim.eval() encounters a Vim error, a try/catch in the
            Python code doesn't catch it. (Yggdroot Chen)
Solution:   Throw exceptions on errors in vim.eval(). (ZyX)

Problem:    Python: interrupt not being properly discarded. (Yggdroot Chen)
Solution:   Discard interrupt in VimTryEnd. (ZyX)

Problem:    Crash when using invalid key in Python dictionary.
Solution:   Check for object to be NULL.  Add tests. (ZyX)

Problem:    Python: non-import errors not handled correctly.
Solution:   Let non-ImportError exceptions pass the finder. (ZyX)

Problem:    Python: WindowSetattr() missing support for NUMBER_UNSIGNED.
Solution:   Add NUMBER_UNSIGNED, add more tests. Various fixes. (ZyX)

Problem:    Various Python problems.
Solution:   Fix VimTryEnd. Crash with debug build and PYTHONDUMPREFS=1. Memory
            leaks in StringToLine(), BufferMark() and convert_dl. (ZyX)

Problem:    Python: use of numbers not consistent.
Solution:   Add support for Number protocol. (ZyX)

Problem:    Python: Exception messages are not clear.
Solution:   Make exception messages more verbose. (ZyX)

Problem:    Inconsistent string conversion.
Solution:   Use 'encoding' instead of utf-8. Use METH_O in place of
            METH_VARARGS where appropriate. (ZyX)