Problem:    Python SystemExit exception is not handled properly.
Solution:   Catch the exception and give an error. (Yasuhiro Matsumoto, Ken
            Takata)

Problem:    Python 2 and 3 use different ways to load modules.
Solution:   Use the same method. (ZyX)

Problem:    Python 2: loading modules doesn't work well.
Solution:   Fix the code. Add more tests. (ZyX)

Problem:    Not easy to load Python modules.
Solution:   Search "python2", "python3" and "pythonx" directories in
            'runtimepath' for Python modules. (ZyX)

Problem:    Python: Changing directory with os.chdir() causes problems for
            Vim's notion of directories.
Solution:   Add vim.chdir() and vim.fchdir(). (ZyX)

Problem:    Python: a few recently added items are not documented.
Solution:   Update the documentation. (ZyX)

Problem:    Python: popitem() was not defined in a standard way.
Solution:   Remove the argument from popitem(). (ZyX)

Problem:    Python: documentation lags behind.
Solution:   Python patch 26. (ZyX)

Problem:    Python: Dictionary is not standard.
Solution:   Python patch 20: Add standard methods and fields. (ZyX)

Problem:    Python: can't assign to vim.Buffer.name.
Solution:   Python patch 3. (ZyX)

Problem:    Python: Can't check types of what is returned by bindeval().
Solution:   Add vim.List, vim.Dictionary and vim.Function types. (ZyX)

Problem:    There is ":py3do" but no ":pydo".
Solution:   Add the ":pydo" command. (Lilydjwg)

Problem:    Python: not so easy to access tab pages.
Solution:   Add window.tabpage, make window.number work with non-current tab
            pages. (ZyX)

Problem:    Python does not have a "do" command like Perl or Lua.
Solution:   Add the ":py3do" command. (Lilydjwg)

Problem:    Python: It's not easy to change window/buffer/tabpage.
Solution:   Add ability to assign to vim.current.{tabpage,buffer,window}.
            (ZyX)

Problem:    Python: no easy access to tabpages.
Solution:   Add vim.tabpages and vim.current.tabpage. (ZyX)

Problem:    Python: No iterator for vim.list and vim.bufferlist.
Solution:   Add the iterators. Also fix name of FunctionType. Add tests for
            vim.buffers.  (ZyX)

Problem:    Python: List of buffers is not very useful.
Solution:   Make vim.buffers a map. No iterator yet. (ZyX)

Problem:    Python: Can't get position of window.
Solution:   Add window.row and window.col. (ZyX)

Problem:    Python: not easy to get to window number.
Solution:   Add vim.window.number. (ZyX)

Problem:    Python interface can't easily access options.
Solution:   Add vim.options, vim.window.options and vim.buffer.options. (ZyX)

Problem:    Python: Access to Vim variables is not so easy.
Solution:   Define vim.vars and vim.vvars. (ZyX)

Problem:    Small mistakes in comments, proto and indent.
Solution:   Fix the mistakes.

Also update runtime files