* lang/python/pyme/core.py (GpgmeWrapper.__repr__): Saner
representation.
(GpgmeWrapper.__str__): Construct a nicer human readable string.
(GpgmeWrapper._boolean_properties): New field.
(GpgmeWrapper.__wrap_boolean_property): New function.
(GpgmeWrapper.__getattr__): Wrap functions using properties.
(GpgmeWrapper.__setattr__): New method.  Likewise wrap functions.
(Context.signers): New property.
(Context.pinentry_mode): Likewise.
(Context._boolean_properties): List boolean properties.
(Context.__init__): Add keyword arguments for properties and apply
them.