minor edits in geocubit subroutines #160

Job	Run time
Check file changes	26s
Test on Mac	12m 52s
Test on ubuntu-latest	2m 48s
Test on ubuntu-20.04	2m 13s
Test Intel on ubuntu-20.04	5m 58s
Test run example 0 - make tests	6m 43s
Test run example 3 - layered halfspace	5m 42s
Test run example 10 - homogeneous halfspace	4m 23s
Test run example 1 - meshfem3D simple model	6m 36s
Test run example 2 - fault tpv5	7m 14s
Test run example 4 - small adjoint	3m 51s
Test run example 5 - socal1D	4m 58s
Test run example 6 - socal1D 1d_socal	3m 11s
Test run example 7 - socal1D 1d_prem	4m 35s
Test run example 8 - socal1D 1d_cascadia	4m 38s
Test run example 9 - coupling FK	4m 4s
Test run example 11 - poroelastic	4m 59s
Test run example 12 - PML elastic	2m 45s
Test run example 13 - PML acoustic	5m 18s
Test run example 14 - waterlayered halfspace	6m 6s
Test run example 16 - cavity	2m 35s
Test run example 15 - tomographic model	4m 6s
Test run example 17 - sep bathymetry	2m 52s
	1h 48m 53s

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