use-grg=true as default when grid symmetry is broken and enhance MSG support

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[codecov-commenter]

Codecov Report

❌ Patch coverage is 80.64516% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.85%. Comparing base (4f2ebe0) to head (71bb15a).
⚠️ Report is 55 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/phelel/velph/cli/utils.py	75.75%	8 Missing ⚠️
src/phelel/velph/cli/phelel/generate.py	0.00%	2 Missing ⚠️
src/phelel/velph/cli/init/init.py	96.15%	1 Missing ⚠️
src/phelel/velph/cli/nac/generate.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #114      +/-   ##
===========================================
+ Coverage    72.07%   72.85%   +0.77%     
===========================================
  Files           81       81              
  Lines         5791     5920     +129     
===========================================
+ Hits          4174     4313     +139     
+ Misses        1617     1607      -10     

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