Python 2 is a bit more picky with respect to
the correct name of the module. If passing "db"
to a module called dbcore, it will exit with
a SystemError.
- Unify structure of Python module sources so the pymod.pri can be used for all modules
- switch to tlcore, dbcore and rdbcore + distutils_src wrapper modules
* Added unit test for this
* Provided an option for easier debugging such issues:
Setting env var KLAYOUT_VERBOSITY will enable debug levels on Python
modules (and all other binaries). Plugin loading issues can
be debugged by setting KLAYOUT_VERBOSITY=21.