updates compute element routines (w/ pure statements); pre-computes jacobian; updates mesh permutation routines

[danielpeter]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 23.15522% with 604 lines in your changes missing coverage. Please review.

Project coverage is 37.31%. Comparing base (46dd8d6) to head (72430ec).
Report is 14 commits behind head on devel.

Files with missing lines	Patch %	Lines
src/meshfem3D/setup_color_perm.f90	1.64%	358 Missing ⚠️
src/gindex3D/create_gindex.f90	0.00%	87 Missing ⚠️
src/shared/write_VTK_file.f90	0.00%	47 Missing ⚠️
src/specfem3D/SIEM_index_region.F90	0.00%	40 Missing ⚠️
src/specfem3D/compute_element.F90	34.48%	38 Missing ⚠️
src/specfem3D/compute_element_strain.F90	0.00%	10 Missing ⚠️
src/specfem3D/check_stability.f90	75.75%	8 Missing ⚠️
src/meshfem3D/setup_inner_outer.f90	80.00%	4 Missing ⚠️
...rc/specfem3D/compute_forces_crust_mantle_noDev.f90	0.00%	3 Missing ⚠️
src/specfem3D/compute_forces_inner_core_noDev.f90	0.00%	3 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##            devel     #847      +/-   ##
==========================================
- Coverage   37.40%   37.31%   -0.10%     
==========================================
  Files         279      279              
  Lines       64313    64562     +249     
==========================================
+ Hits        24056    24091      +35     
- Misses      40257    40471     +214     

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