Compute b matrices on the fly

For easier reading.

This is slightly slower, but also uses less memory.

Fix secondary variable computation in HT process

FluidProperties is a process independent container
for common fluid properties like density, viscosity
and specific heat capacity.

Fixed a bug in PETScVector

to set a local vector of a processor from the global one.

[CMake] Run git submodule sync in CMake

This fixes submodule checkout errors when the submodules URL changed.

Fixed also a CMake error when CVODE_KLU variable was not defined.

Code coverage Jenkins job