spectral 1.3
- improved documentation
- FFT as well as any LOMB version work with multivariate input
- Added generalized Lomb-Scargle method
- improved speed of both the normal Lomb-Scargle Method and generalized Lomb
- power spectral density is now normalized to sample varaiance
- limit memory usage
version < 1.3
- developement of all functions
- developement of concepts