Adding option to write molecular abundance array to fits file #491

Job	Run time
build+test (macos-arm, gfortran, openmp=yes, release=yes)	10m 39s
build+test (macos-arm, gfortran, openmp=yes, release=no)	10m 17s
build+test (macos-arm, gfortran, openmp=no, release=yes)	23m 31s
build+test (macos-arm, gfortran, openmp=no, release=no)	22m 22s
build+test (macos-intel, gfortran, openmp=yes, release=yes)	18m 8s
build+test (macos-intel, gfortran, openmp=yes, release=no)	23m 21s
build+test (macos-intel, gfortran, openmp=no, release=yes)	45m 58s
build+test (macos-intel, gfortran, openmp=no, release=no)	49m 46s
build+test (linux, gfortran, openmp=yes, release=yes)	13m 28s
build+test (linux, gfortran, openmp=yes, release=no)	13m 24s
build+test (linux, gfortran, openmp=no, release=yes)	29m 27s
build+test (linux, gfortran, openmp=no, release=no)	29m 1s
build+test (linux, ifort, openmp=yes, release=yes)	20m 36s
build+test (linux, ifort, openmp=yes, release=no)	18m 17s
build+test (linux, ifort, openmp=no, release=yes)	34m 12s
build+test (linux, ifort, openmp=no, release=no)	37m 19s
benchmark (gfortran)	4m 38s
release	0s
	6h 44m 24s

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