- Python 3.12 doesn't like SafeConfigParser
- Python 2.7 doesn't like versioneer > 0.18

This library no longer exists in Python 3.12

It looks like it isn't even needed in Python 2.7 to use pickle
and redirecting_html.py should go away (but fixed it anyway).

Based on https://github.com/scipy/scipy/pull/20172/files
as suggested by https://numpy.org/devdocs/numpy_2_0_migration_guide.html#adapting-to-changes-in-the-copy-keyword

Broken in 2eed418

petsc(4py) 3.21.2 crashes when running tests in parallel:

```
mesh2D (examples.cahnHilliard)
Doctest: examples.cahnHilliard.mesh2D ...  Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
 Internal error 2 in DMUMPS_LOAD_RECV_MSGS  1275068685          52
 Internal error 1 in DMUMPS_LOAD_PROCESS_MESSAGE
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 1 (rank 1 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 1
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
Abort(-99) on node 0 (rank 0 in comm 0): application called MPI_Abort(MPI_COMM_WORLD, -99) - process 0
 Internal error 1 in DMUMPS_LOAD_PROCESS_MESSAGE
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
 Internal error 2 in DMUMPS_LOAD_RECV_MSGS  1275068685          52
 Internal error 1 in DMUMPS_LOAD_PROCESS_MESSAGE
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
 Internal error 1 in DMUMPS_LOAD_PROCESS_MESSAGE
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
 Internal error 2 in DMUMPS_LOAD_RECV_MSGS  1275068685          52
 Internal error 1 in DMUMPS_LOAD_PROCESS_MESSAGE
 Internal error 1 in DMUMPS_LOAD_RECV_MSGS           1
```

Update Nix build to use Python 3.12, NixOS 24.05. Also, include
aarch4-darwin as a possible build.

Currently, there is a single test failure in
fipy.matrices.scipyMatrix._ScipyMatrix.

Generate the egg_info before executing the tests otherwise setup.py
doesn't register the correct version of the test suite, but possibly
the older version already available in nixpkgs.