updates examples and utils folder; adds support for nummaterial_velocity_file for external meshes; updates config files #107

Job	Run time
Check file changes	19s
Test Intel on ubuntu-20.04	12m 29s
Test on Mac	5m 28s
Test on ubuntu-latest	1m 11s
Test on ubuntu-20.04	1m 11s
Test run example 0 - make tests	2m 14s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 12s
Test run example 1 - benchmark claerbout kernel acoustic	2m 26s
Test run example 11 - tomographic_ocean_model	1m 32s
Test run example 2 - benchmark claerbout kernel elastic P-SV	3m 21s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 53s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	2m 37s
Test run example 6 - anisotropy	1m 26s
Test run example 5 - moving sources	1m 45s
Test run example 7 - Industrial_Format_SEP	4m 11s
Test run example 8 - axisymmetric_case_AXISYM_option	1m 53s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 12s
	49m 20s

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