Adding delay support for IIR better implementation
Changelog
Fix the Butterworth filter
Using new delay to speed up IIR computation
Using a temporary value when doing the computation
Using the input delay to enhance the oversampling computation
Cosmit
Updated mind map
Added FFTW support
Added preliminary FFTW support
Using now aligned data

Fixed the coefficient issue in the FFT
Merge branch 'feature/FFTWSupport' into develop
Missing parent setup calls
Adding a small profiling facility
Changelog
Buttercoefficients output with Python OK
Fixed the profiling module
Fixing amplitude issue
The coefficient generation is not precise enough :/ The associated low pass filter is quite different that the scipy version
Refactored how butter worth coefficients are computed. Should put the common pieces somewhere else like IIR