[Kst] extragear/graphics/kst/patches

[Brisset, Nicolas]

>   I can't help but think that our PSD algorithm could be a 
> point of improvement too.  It's a big glaring hotspot in the 
> profiler, comparable to the equation interpreter (which 
I have always wondered why kst uses its own FFT algorithms instead of
using the apparently very common libfftw library, which I suppose has
been optimized (I have never checked, though)...