Function for density processing
New function using FIR
ZeroCross Determination zero crossing time point by linear interpolation
Merge branch 'Density'
Merge branch 'TrekSDD_Filter'
Merge branch 'TrekSDD_MergeMK'
DensityCross fixed bug indexing exceed matrix dimensions
DensityFFTPhase. Introduced separate Step and fft window.

Works slow (all Fourier images saved)
FFTPhase. Optimized Speed.
CrossZero works on unfiltered trek, but slow
ZeroCross works fast. Checking for noise is performed only where necessary.
Prepare for determination Phase by Fbase
Directory Structure rearangment
Merge branch 'Density'
Merge branch 'TrekSDD_MergeMK'
New Folder for Noise functions
ZeroCross adde input argument Fbase
Fbase in Density function changed
Merge branch 'Density'
NoiseStd added