Add index-index mapping for arrays #968

Job	Run time
Build and Test - Dockerfile	2m 25s
Build and Test - Dockerfile	1m 55s
Build and Test - Dockerfile.memcheck	3m 5s
Build and Test - Dockerfile.memcheck	2m 59s
Build and Test - Dockerfile.fortran-gcc	4m 26s
Build and Test - Dockerfile.fortran-gcc	3m 59s
Build and Test - Dockerfile.openmp	3m 26s
Build and Test - Dockerfile.openmp	3m 1s
Build and Test - Dockerfile.mpi	3m 31s
Build and Test - Dockerfile.mpi	3m 4s
Build and Test - Dockerfile.mpi_openmp	3m 39s
Build and Test - Dockerfile.mpi_openmp	2m 52s
Build and Test - Dockerfile.python	2m 30s
Build and Test - Dockerfile.python	2m 30s
Build and Test - Dockerfile.pip	2m 1s
Build and Test - Dockerfile.pip	1m 45s
	47m 8s

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