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Draft: Start making CASPT2 compatable with 64-bit MPI.

Ernst D. Larsson requested to merge caspt2_64bit-mpi_compatability into master

CASPT2 seems to be incompatible with 64bit MPI libraries. This MR will fix remedy that, and possibly add some updates from integer*4 to MPIInt in other codes.

  • Documentation updated or not needed.
  • Test created or not needed.
  • Attribution in source files and CONTRIBUTORS.md updated if necessary.
  • Implement automatic way in cmake to detect if MPI is built for 32 or 64 bit integers.
  • Test fix for more compiler/MPI library combinations.
Edited by Ernst D. Larsson

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