RichardsMechanics; Update mass lumping procedure.

Add mapping from points of a pyramid face to points in the pyramid element.

tnagel authored Apr 24, 2020 and Dmitry Yu. Naumov committed Apr 26, 2020

This allows for mass lumping.
Part of the pressure-pressure jacobian block is now also
diagnalized if mass lumping is used.

[RM] Alternative mass balance

Correct flux direction

Updated result files of RichardsFlow_2d_small, RichardsFlow_2d_small_masslumping, Richards_2d_geometry_OBSERVATION_POINT and deformation_dependent_porosity_swelling tests

Added alternative_mass_balance_anzInterval_10 test, mesh and result files, added alternative_mass_balance_anzInterval_10 block to Tests.cmake

[CMake] Unity builds

NumLib tests are still not unity build.

Will be replaced by native CMake precompiled headers.

RichardsMechanics restart

... functions setKelvinVector and setScalar.

Needed for restart test case.