Further update of Gmsh MeshIO -> Specfem2D script #122

Job	Run time
Check file changes	16s
Test on Mac	9m 18s
Test Intel on ubuntu-20.04	4m 59s
Test on ubuntu-latest	1m 8s
Test on ubuntu-20.04	1m 40s
Test run example 0 - make tests	2m 13s
Test run example 11 - tomographic_ocean_model	1m 21s
Test run example 1 - benchmark claerbout kernel acoustic	2m 14s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 8s
Test run example 11 - Marmousi2	2m 9s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 39s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	2m 33s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 43s
Test run example 5 - moving sources	2m 6s
Test run example 6 - anisotropy	2m 0s
Test run example 7 - Industrial_Format_SEP	4m 17s
Test run example 8 - axisymmetric_case_AXISYM_option	1m 58s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 12s
	47m 54s

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