v6: Update to Baselibs 9.12.0

This PR updates v6 to Baselibs 9.12.0 which has updates to GFE as well as adding fftw for LDAS/NAG work.

We also move NAS to use Intel MPI by default instead of MPT which has issues with OpsL91 runs.

Testing shows this is zero-diff.

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From CHANGELOG.md

Changed

• Update to Baselibs 8.32.0
  • GFE v1.28.0
    • pFUnit v4.19.0
    • pFlogger v1.18.1
  • fftw v3.3.11
  • Various fixes for compiler testing
• Move to Intel MPI at NAS by default
  • This is due to issue found with Ops L91 runs with MPT in v12

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What's Changed

• v6: Update to Baselibs 9.12.0 by @mathomp4 in #187

Full Changelog: v6.7.0...v6.8.0