Cleanup

[cnegre]

Cleanup of the test main driver.

mtx matrix are read using bml_read_matrix

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This change is 

[codecov]

Codecov Report

Merging #141 into master will increase coverage by 6.7%.
The diff coverage is 71.73%.

@@            Coverage Diff            @@
##           master     #141     +/-   ##
=========================================
+ Coverage   33.49%   40.19%   +6.7%     
=========================================
  Files          62       61      -1     
  Lines       11951    12167    +216     
  Branches     1308     1338     +30     
=========================================
+ Hits         4003     4891    +888     
+ Misses       7630     6741    -889     
- Partials      318      535    +217

Impacted Files	Coverage Δ
tests/src/main.F90	80.06% <71.73%> (-2.31%)	⬇️
examples/gpmd/gpmd.F90	61.47% <0%> (-3.02%)	⬇️
examples/gpdist/gpmd_dist.F90	0% <0%> (ø)	⬆️
examples/mdresponse/mdresponse.F90	0% <0%> (ø)	⬆️
examples/gpdist/gpscf_dist.F90	0% <0%> (ø)	⬆️
examples/gpscfcov/gpscfcov.F90	0% <0%> (ø)	⬆️
examples/Mtest/metis_partition.F90	0% <0%> (ø)	⬆️
examples/gploop/gploop.F90	0% <0%> (ø)	⬆️
src/prg_densitymatrix_mod.F90	64.45% <0%> (+0.47%)	⬆️
... and 13 more

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