mdolab/dafoam: v2.2.9

This release improved the performance and upgraded the dependencies. Added the support for Ubuntu 20.04 and Python 3.7 Used the reverse-mode AD as the default. Adjoint is now machine precision accurate in parallel. Refer to a recent update in OpenFOAM-v1812-AD Fixed the regression tests such that they are more compatible for various platforms. Fixed a bug in global indexing with field derivative and meshWaveFrozen Make files https://github.com/mdolab/dafoam/commit/e63aa44500d53878a5050b34cc12c5ab457d73b