code cleaning; fixes OpenMP statements #126

Job	Run time
Check file changes	14s
Test Intel on ubuntu-20.04	6m 6s
Test on Mac	6m 29s
Test on ubuntu-latest	1m 4s
Test on ubuntu-20.04	1m 16s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 40s
Test run example 0 - make tests	2m 54s
Test run example 1 - benchmark claerbout kernel acoustic	3m 0s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 10s
Test run example 3 - benchmark claerbout kernel elastic SH	2m 47s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	3m 15s
Test run example 5 - moving sources	2m 31s
Test run example 6 - anisotropy	1m 25s
Test run example 7 - Industrial_Format_SEP	4m 23s
Test run example 8 - axisymmetric_case_AXISYM_option	1m 45s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 24s
Test run example 11 - tomographic_ocean_model	1m 45s
Test run example 12 - Marmousi2	2m 8s
	48m 16s

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