Release 0.22.0

[kevinstratford]

Changes should be outlined in CHANGES.md

• [x] update config/unix-gcc-default.mk
• [x] update config/unix-mpicc-default.mk
• [x] update Cirrus nvcc/openmpi config
• [x] documentation ellipsoid lubrication corrections
• [x] Changes to porous media input
• [x] move model.c to lb_data.c to avoid confusion

[kevinstratford]

25th July 2024