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* WIP: module -> module_ without typedef

* refactor: allow py::module to work again

Change base parameter type in register_exception and exception constructor from PyObject* to handle (#2467)

* Change base parameter type in register_exception and excepion constructor from PyObject* to handle

* Fix compilation error passing `handle` to `PyObject*`

* Add note about specifying custom base.

* Update exception docs based on PR feedback.

* Fix trailing whitespace.
Co-authored-by: Michal Sustr <michal.sustr@aic.fel.cvut.cz>

The main change is to treat error_already_set as a separate category
of exception that arises in different circumstances and needs to be
handled differently. The asymmetry between Python and C++ exceptions
is further emphasized.

To deal with exceptions that hit destructors or other noexcept functions.

Includes fixes to support Python 2.7 and extends documentation on
error handling.

@virtuald and @YannickJadoul both contributed to this PR.

Found via `codespell`