[eigen] Ooura FFT backend

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I noticed that the backends available today for Eigen are KISSFFT and FFTW3.. However, the Ooura FFT is around twice as fast as KISSFFT (at least acc. to http://www.fftw.org/speed/CoreDuo-3.0GHz-icc64/)
It seems that it only supports powerof2 sizes though, so is that why it hasn't been considered ?


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