PO: Fix PhaseOffset calculatin (*Tau)
Output functions: Increase precision.
Filter: rework + improve
Config: Adjust predefined PSD values.
NoiseCfg: Move verbose output.
FFD: Add frequency.
NoiseCfg: Add ADEV exponents.
NoiseCfg: Invert constants.
main: adjust to current structure.
NoiseCfg: Add flag to enable/disable Interpolation.
NoiseCfg: Fix order of PSD factors.
NoiseCfg: Change default parameters.
Fitler: Adjust interface.
Filter: Adjust correction factors.
Filter: Add function to read out FilterLen.
FFD: set remaining values to zero when filling the FFD vector.
FFD: Add new filling routine.
FFD: cleanup.
PhaseOffsetGenerator: Add initial revision.
main: adjust.