NEM_SLICE: Remove a template array which was not needed to be a template #52

Job	Run time
build-deps (gnu, V110, 4.9.2, 4.4.0)	4m 30s
build-deps (clang, V110, 4.9.2, 4.4.0)	4m 3s
build-deps (mpi, V110, 4.9.2, 4.4.0)	4m 52s
Debug serial build	6m 14s
Debug parallel build	6m 30s
Threadsafe ON, No Fortran	4m 21s
Threadsafe ON, Parallel, No Fortran	5m 44s
Sanitize address, no fortran	5m 50s
Sanitize undefined	6m 41s
Sanitize integer	4m 38s
GTest Enabled	6m 13s
No applications, legacy, or fortran	4m 1s
CATALYST2, parallel	8m 30s
KOKKOS, parallel	8m 0s
No deprecated exodus functions	7m 59s
Use modern CMake configure of netCDF and HDF5 packages with GTest	8m 28s
ADIOS2 enabled	11m 49s
FAODEL and METIS enabled	12m 21s
	2h 0m 44s

Provide feedback