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Draft: Merge branch 'reintroduce_pfft_support' into 'hotfix-14.2'

Martin Lueders requested to merge cherry-pick-84391715 into hotfix-14.2

Description

Roll back the removal of FFTW-mpi from autotools, and re-include its header in the Octopus source, such that PFFT will work. This follows on from discussions in MR !2299 (merged) One notes that this does not address support of FFTW-mpi or PFFT with cmake.

News snippet

Roll back the removal of FFTW-mpi from autotools, and re-include its header in the Octopus source, such that PFFT will work.

Checklist

  • I have checked that my code follows the Octopus coding standards
  • I have added tests for all the new features added in this request.

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