Incorrect svn_txdelta_window_t Python binding

There's a bug with Python binding for the svn_txdelta_window_t structure. The
problem is that the 'ops' array is mapped to Python as a single object, not as
a sequence of 'num_ops' items. That is, the following code for apply_textdelta
does not work:

def apply_textdelta(self, file_baton, base_checksum):
  self.dbg(("apply_textdelta to %s" % (file_baton[0])))
  def txdelta_handler(window):
    if window is None:
      self.dbg("txdelta - stop")
    else:
      self.dbg(("txdelta - %s [%d,%d] [X,%d] %d %d" %
          (file_baton[0], window.sview_offset, window.sview_len,
            window.tview_len, window.src_ops, window.num_ops)))
      for o in window.ops:
        self.dbg(("  op: %d,%d,%d" % (o.action_code, o.offset, o.length)))
  return txdelta_handler

It fails with the error that "for o in window.ops: TypeError: iteration over
non-sequence". The following code works, but it can only access the first item
in the 'ops' array:

self.dbg(("  op: %d,%d,%d" %
  (window.ops.action_code, window.ops.offset, window.ops.length)))

This has been confirmed to be a bug on dev@subversion.apache.org in March 2010.

Original issue reported by stilor