Problem: Python 3: vim.error is a 'str' instead of an 'Exception' object,
so 'except' or 'raise' it causes a 'SystemError' exception.
Buffer objects do not support slice assignment.
When exchanging text between Vim and Python, multibyte texts become
gabage or cause Unicode Expceptions, etc.
'py3file' tries to read in the file as Unicode, sometimes causes
UnicodeDecodeException
Solution: Fix the problems. (lilydjwg)
Problem: Python code defines global "buffer". Re-implements a grow-array.
Solution: Use a grow-array instead of coding the same functionality. Handle
out-of-memory situation properly.
