Improved tests

[llaniewski]

This PR introduces improvement in testing:

• periodic offset option in compare which allows to compare two vti/pvti files with a spatial offset.
• adding a file (tools/etc/test.exceptions.sh) with test exceptions
• test for d3q27_pf_velocity (drop on wall)

[codecov-commenter]

Codecov Report

Patch coverage: 97.29% and project coverage change: +1.95% 🎉

Comparison is base (cc4b885) 40.74% compared to head (f5b900d) 42.69%.

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Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #439      +/-   ##
===========================================
+ Coverage    40.74%   42.69%   +1.95%     
===========================================
  Files          157      159       +2     
  Lines         7046     7504     +458     
===========================================
+ Hits          2871     3204     +333     
- Misses        4175     4300     +125     

Flag	Coverage Δ
d2q9	30.60% <88.57%> (+0.11%)	⬆️
d2q9_bc	26.90% <88.57%> (+0.12%)	⬆️
d2q9_kuper	27.75% <88.57%> (+0.11%)	⬆️
d3q27_PSM_NEBB	35.66% <97.14%> (+0.14%)	⬆️
d3q27_pf_velocity	30.57% <89.18%> (?)

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Files Changed	Coverage Δ
src/compare.cpp	96.00% <97.14%> (+1.10%)	⬆️
models/multiphase/d3q27_pf_velocity/Dynamics.c.Rt	61.65% <100.00%> (ø)

... and 17 files with indirect coverage changes

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