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Use the threaded version of FFTW to speed-up the PM part of the code.

Matthieu Schaller requested to merge parallel_fftw into master

This gives a really small speed up over all but why not make use of that feature if we can.

The only worry I have is that some installed FFTWs may not have the threaded version available. Should we attempt to detect this and only activate the threaded version if detected.

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