* python/configuration.cc: Support the 'in' operator for Configuration

Support the replacement of mapping.has_key() for Configuration,ConfigurationPtr
and ConfigurationSub objects.
  
This is implemented by extending the various types with the tp_as_sequence
slot, which refers to a PySequenceMethods containing only this method.
  
The CnfGetAttr() function has been removed and replaced by the use of the
tp_method slot. This helps the py3k port because the previously used
Py_FindMethod() is not avilable anymore.

This completes the support of the 'in' operator in all python-apt objects,
which makes it even easier to convert python-apt-using applications to py3k
once python-apt supports it, as 2to3 converts 'm.has_key(k)' to 'k in m'.

Also finalize the types in apt_pkgmodule.cc and add the new 'key in conf'
description to the documentation.

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