Using C++ types in documentation for Python users is more harmful than
useless, so use Python types whenever possible and allow defining "doctype"
typemap to customize this for the user-defined types.
reST is standard Python markup, so use *...*, ``...`` and so on instead of
_..._, '...' etc.
No other changes even though the mapping of some Doxygen tags to markup used
for them seems suspicions (e.g. \var almost certainly should be the same as
\em).
Use the more or less standard :param:, :type:, :return: and :raises: in the
function/methods descriptions.
Update the output expected from the Python tests accordingly.
Update Doxygen-specific Python unit tests to work with the new indentation.
Update one of Doxygen-specific Java tests to still build with the new handling
of srcdir.
