ValueProxy __reduce_ex__ is unary operator

[dnephin]

__reduce_ex__ should be added to unary operator list.

  File "/usr/lib/python2.6/copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python2.6/copy.py", line 255, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib/python2.6/copy.py", line 162, in deepcopy
    y = copier(x, memo)
  File "/usr/lib/python2.6/copy.py", line 255, in _deepcopy_dict
    y[deepcopy(key, memo)] = deepcopy(value, memo)
  File "/usr/lib/python2.6/copy.py", line 181, in deepcopy
    rv = reductor(2)
  File "/usr/lib/pymodules/python2.6/staticconf/proxy.py", line 52, in method
    return getattr(operator, name)(self.value, *args)
TypeError: __reduce_ex__() takes at most 1 argument (2 given)

[dnephin]

This method is used for pickling. Pickling a ValueProxy doesn't make much sense anyway (only the underlying .value should be pickled). For now I will remove reduce_ex so that it fails with a better error message of

TypeError: a class that defines __slots__ without defining __getstate__ cannot be pickled