issue with py2exe
a package produced by py2exe crashes in panel.py `114:  f.__doc__ = f.__doc__ % str(op)` with message:

<pre>
File "zipextimporter.pyo", line 82, in load_module
  File "pandas\core\panel.pyo", line 145, in <module>
  File "pandas\core\panel.pyo", line 690, in Panel
  File "pandas\core\panel.pyo", line 114, in _panel_arith_method
TypeError: unsupported operand type(s) for %: 'NoneType' and 'str'
</pre>


commenting this line out solves the problem in a workaround way. I guess the `.__doc__` property becomes None somehow .
