code cleaning (by script ./utils/scripts/clean_listings_specfem.py) and fixes compiler warnings; adding hdf5 github actions compilation test #198

Job	Run time
Check file changes	24s
Test Intel on ubuntu-22.04	11m 28s
Test on Mac	7m 22s
Test on ubuntu-latest	2m 39s
Test on ubuntu-22.04	2m 37s
Test run example 4 - point_force	4m 23s
Test run example 1 - regional_Greece_small debug	2m 1s
Test run example 2 - regional_Greece_small	3m 44s
Test run example 3 - regional_sgloberani	3m 34s
Test run example 5 - moon_global	5m 22s
Test run example 0 - make tests	10m 18s
Test run example 6 - mars_regional	3m 5s
Test run example 10 - regional_Greece_small_LDDRK kernel ADIOS2	10m 40s
Test run example 11 - regional_Greece_small hdf5 i/o	3m 49s
Test run example 7 - global_small	5m 8s
Test run example 8 - global_small w/ FULL_GRAVITY netCDF	10m 28s
Test run example 9 - global_small w/ FULL_GRAVITY PETSc	5m 5s
	1h 32m 7s

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