[PATCH] fix for FileDiff class in python bindings (resend)

Log Message:

Changes to make svn.fs.FileDiff class work on windows.

* subversion/bindings/swig/python/svn/fs.py
  (_escape_msvcrt_shell_command, _escape_msvcrt_shell_arg):
  added these functions for escaping command lines on windows

  (FileDiff.get_pipe): changed to convert argument list to a string
  on windows to avoid "TypeError: popen2() argument 1 must be string,
  not list"

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