Fixed acoustic free surface computation within the mesher #151

Job	Run time
Check file changes	16s
Test on Mac	4m 41s
Test on ubuntu-22.04	1m 20s
Test on ubuntu-latest	1m 24s
Test Intel on ubuntu-22.04	9m 40s
Test run example 0 - make tests	3m 44s
Test run example 6 - anisotropy	1m 46s
Test run example 1 - benchmark claerbout kernel acoustic	2m 38s
Test run example 12 - Marmousi2	2m 28s
Test run example 13 - Gmsh w/ Stacey	1m 52s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	2m 57s
Test run example 2 - benchmark claerbout kernel elastic P-SV	2m 50s
Test run example 8 - axisymmetric_case_AXISYM_option	2m 27s
Test run example 7 - Industrial_Format_SEP	4m 32s
Test run example 3 - benchmark claerbout kernel elastic SH	3m 26s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 23s
Test run example 11 - tomographic_ocean_model	1m 39s
Test run example 5 - moving sources	1m 57s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 24s
Test run example 14 - EM	1m 19s
	55m 43s

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