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Added path suffix to search for scotch.h.

This MR improves the ability for CMake to find an available version of Scotch.

  • It adds support for a couple of environmental variables to help find scotch in non-system paths.
  • It adds a suffix path to the ThirdParty Scotch library search to allow it to find the header file on some Linux distributions where it is located within a sub-directory.
  • It moves the finding of the Scotch libraries out into a FindScotch module.
  • Adds support to check the version of Scotch and select what is acceptable.
Edited by Chris Cantwell

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