renames real*8 to double precision #243

Job	Run time
Check file changes	20s
Test on Mac	7m 57s
Test Intel on ubuntu-22.04	17m 56s
Test on ubuntu-latest	8m 42s
Test on ubuntu-22.04	2m 5s
Test 1 - meshfem3D simple model	8m 32s
Test 3 - layered halfspace	6m 57s
Test 2 - fault tpv5	8m 21s
Test 0 - make tests	10m 4s
Test 10 - socal1D 1d_cascadia	9m 50s
Test 12 - homogeneous halfspace	7m 55s
Test 11 - coupling FK	4m 20s
Test 13 - poroelastic	6m 32s
Test 14 - PML elastic	3m 23s
Test 15 - PML acoustic	5m 49s
Test 16 - waterlayered halfspace	5m 7s
Test 17 - tomographic model	4m 32s
Test 18 - cavity	4m 4s
Test 19 - sep bathymetry	3m 48s
Test 20 - socal1D HDF5 I/O	6m 15s
Test 21 - meshfem3D simple model w/ ADIOS2	8m 6s
Test 22 - coupling SPECFEM	10m 47s
Test 4 - small adjoint	6m 36s
Test 5a - kernel homogeneous acoustic	4m 48s
Test 5b - kernel homogeneous acoustic GPU HIP	12m 54s
Test 6a - kernel homogeneous halfspace	9m 6s
Test 7 - socal1D	4m 48s
Test 6b - kernel homogeneous halfspace GPU HIP	25m 55s
Test 8 - socal1D 1d_socal	3m 19s
Test 9 - socal1D 1d_prem	4m 55s
	3h 43m 43s

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