Merge pull request #130 from cpinte/non_empty_cells #452

Job	Run time
build+test (macos-arm, gfortran, openmp=yes, release=yes)	10m 20s
build+test (macos-arm, gfortran, openmp=yes, release=no)	10m 58s
build+test (macos-arm, gfortran, openmp=no, release=yes)	23m 4s
build+test (macos-arm, gfortran, openmp=no, release=no)	26m 36s
build+test (macos-intel, gfortran, openmp=yes, release=yes)	21m 48s
build+test (macos-intel, gfortran, openmp=yes, release=no)	24m 40s
build+test (macos-intel, gfortran, openmp=no, release=yes)	50m 38s
build+test (macos-intel, gfortran, openmp=no, release=no)	49m 30s
build+test (macos-intel, ifort, openmp=yes, release=yes)	21m 13s
build+test (macos-intel, ifort, openmp=yes, release=no)	16m 28s
build+test (macos-intel, ifort, openmp=no, release=yes)	42m 11s
build+test (macos-intel, ifort, openmp=no, release=no)	34m 20s
build+test (linux, gfortran, openmp=yes, release=yes)	13m 28s
build+test (linux, gfortran, openmp=yes, release=no)	12m 59s
build+test (linux, gfortran, openmp=no, release=yes)	28m 36s
build+test (linux, gfortran, openmp=no, release=no)	28m 17s
build+test (linux, ifort, openmp=yes, release=yes)	21m 31s
build+test (linux, ifort, openmp=yes, release=no)	18m 35s
build+test (linux, ifort, openmp=no, release=yes)	35m 12s
build+test (linux, ifort, openmp=no, release=no)	37m 43s
benchmark (gfortran)	12m 13s
benchmark (ifort)	5m 45s
release	0s
	9h 6m 5s

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