Bug fix: diffusion approximation with new opacity arrays #149

Job	Run time
build+test (linux, gfortran, openmp=yes, release=yes)	5m 50s
build+test (linux, gfortran, openmp=yes, release=no)	5m 34s
build+test (linux, gfortran, openmp=no, release=yes)	9m 21s
build+test (linux, gfortran, openmp=no, release=no)	8m 55s
build+test (linux, ifort, openmp=yes, release=yes)	14m 14s
build+test (linux, ifort, openmp=yes, release=no)	10m 36s
build+test (linux, ifort, openmp=no, release=yes)	16m 12s
build+test (linux, ifort, openmp=no, release=no)	13m 50s
build+test (macos, gfortran, openmp=yes, release=yes)	11m 31s
build+test (macos, gfortran, openmp=yes, release=no)	6m 57s
build+test (macos, gfortran, openmp=no, release=yes)	13m 32s
build+test (macos, gfortran, openmp=no, release=no)	18m 50s
build+test (macos, ifort, openmp=yes, release=yes)	11m 21s
build+test (macos, ifort, openmp=yes, release=no)	6m 36s
build+test (macos, ifort, openmp=no, release=yes)	16m 5s
build+test (macos, ifort, openmp=no, release=no)	15m 42s
benchmark (gfortran)	7m 51s
benchmark (ifort)	6m 31s
release	0s
	3h 19m 28s

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