Resolve "Tiling of DIA subroutines"

Jonas Ganderton requested to merge 77-DIA_tiling into main

Added tiling to the DIA subroutines.
Includes expansion of GLOBSUM/LOCALSUM in lib_fortran_generic.h90 to:

  • Operate on tile sized arrays
  • Add to an existing sum

Closes #77 (closed)
@dcalvert

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