Fix crash on creating fluid domain with python 3.12.
- Python 3.12 now enforces that
PyImport_AppendInittab
should not be used afterPy_Initialize
has been called. See https://github.com/python/cpython/commit/7f3a4b967cfb1596a3fda6c34f900f8586b16700. - Fixes #18 (closed).