Add a hook for bypassing find_package(MPI)

This is not a great idea, but seems to occasionally be useful when dealing with buggy (and mandatory!) compiler wrappers - particularly those provided by a

Add a hook for bypassing find_package(MPI)

This is not a great idea, but seems to occasionally be useful when dealing with buggy (and mandatory!) compiler wrappers - particularly those provided by a certain well known HPC vendor. If you need this option, you owe one or more of:

1.) the PHASTA team
2.) your compiler vendor
3.) your MPI vendor
4.) your system vendor
5.) CMake

a bug report.

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various utils: include unistd.h for fork() and friends (for debugging)

AcuStat: remove unneeded magic for chdir on old intel compilers

AcuStat: reorder includes

fix various warnings

mhmmmm... bugs it creates, copy and paste does

Initial Commit