Speedup code coverage and include more tests

Dmitri Naumovrequested to merge
endJunction/ogs:SpeedupCodeCoverage into master

Excluding instrumentation from CPM and system headers improves code coverage target runtime.

Further improvements include fixed size matrices, no NaN initialization, enabling Eigen vectorization, and no Eigen and libc++ debugging.

  1. Tests covering your feature were added?
  2. Any new feature or behaviour change was documented?
Edited by Dmitri Naumov

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