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The computation of coherence for white gaussian noise is appropriate to
demonstrate the effect of averaging applied to the the numerical
compuation.

- provide option to select Fourier domain cross correlation
- provide coherence compilation plot

By setting the seed value for the random number generator explicitly we
can reproduce the random number time series. This lets us exactly
reproduce the value used for the publication on TCCA approximation
errors.

discard samples at beginning of trace in case filters result in transient
response to beginning of trace

random number generator returns identical sequences, because it is repeatedly
seeded with them seconds value (execution is too fast to take place at
different wall clock seconds)

introduce namespace croposp
set include statements in compilation units appropriate