Fix implicit conversion of accessors to types derived from py::object #1076
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Fixes #1069.
py::dict d = obj.attr("__dict__");This code requires two implicit conversions,
detail::accessor->py::object->py::dict, but the standard only allows one implicit conversion for user-defined types. It would be strange for the code above to fail to compile, so this PR adds an extra converting ctor to types derived frompy::object.