Coherence and Linear Corelation feature and documentation update
Coherence
The fft_win has changed units from second to samples to provide easier control of input.
The lag_step = 0 was resolved.
The documentation both in code and in separated documentation was updated to newer version with examples.
Linear Correlation
The lag_step = 0 was resolved.
The documentation both in code and in separed documentation was updated to newer version with examples.