Determine MPI Stack

This release adds a new DetermineMPIStack.cmake file that will detect the MPI Stack being used. The stacks it can detect (and therefore are allowed) are below and the variable filled is MPI_STACK:

MPI Stack	MPI_STACK
Open MPI	openmpi
MPICH	mpich
Intel MPI	intelmpi
MVAPICH	mvapich
MPT	mpt

The MPI_STACK variable can be overridden by setting MPI_STACK to one of the allowed values via -DMPI_STACK=...

We will also set MPI_STACK_VERSION to the version of the stack being used. (NOTE: This is the version of the stack not the version of MPI supported by the stack.)

---

From CHANGELOG.md

Fixed

• Quoted generator expression arguments (see #308)

Added

• Added new DetermineMPIStack.cmake file that will detect the MPI Stack being used
  • The allowed stacks are openmpi, mpich, intel, mvapich, mpt which will
    be set in the MPI_STACK variable
    • Can be overridden by setting MPI_STACK to one of the allowed values via -DMPI_STACK=...
  • Will also set MPI_STACK_VERSION to the version of the stack being used
    • NOTE: This is the version of the stack not the version of MPI supported by the stack

---

What's Changed

• Quote generator expression arguments by @mathomp4 in #355
• Use CMake to determine MPI Stack by @mathomp4 in #357
• GitFlow: Merge develop into main for release by @mathomp4 in #358

Full Changelog: v3.40.0...v3.41.0