updates postscript plotting; updates submodules and readme #147

Job	Run time
Check file changes	16s
Test Intel on ubuntu-22.04	13m 15s
Test on ubuntu-latest	1m 59s
Test on Mac	3m 22s
Test on ubuntu-22.04	2m 18s
Test run example 0 - make tests	4m 10s
Test run example 10 - simple_topography_and_also_a_simple_fluid_layer debug double_precision	2m 54s
Test run example 11 - tomographic_ocean_model	2m 3s
Test run example 1 - benchmark claerbout kernel acoustic	2m 18s
Test run example 12 - Marmousi2	2m 34s
Test run example 13 - Gmsh w/ Stacey	1m 59s
Test run example 14 - EM	1m 46s
Test run example 2 - benchmark claerbout kernel elastic P-SV	3m 42s
Test run example 3 - benchmark claerbout kernel elastic SH	3m 52s
Test run example 4 - benchmark claerbout kernel acoustic-elastic	3m 57s
Test run example 5 - moving sources	1m 51s
Test run example 6 - anisotropy	1m 56s
Test run example 7 - Industrial_Format_SEP	5m 30s
Test run example 8 - axisymmetric_case_AXISYM_option	2m 15s
Test run example 9 - simple_topography_and_also_a_simple_fluid_layer debug	2m 37s
	1h 4m 34s

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