v2.12.2b

New:

CMake based builder instead of Scons.
Added M1 (arm64) based docker. Upcoming release Changes:
GitHub actions for CI and docker publications.
Compatibility with petsc 3.16.
Update Docker images: Ubuntu 21.10 and mpich 3.4.2, python 3.9.2, petsc 3.16
Update install_docs/nci gadi

Fixes:

Unit fix for temperature saved in celcius.