No higher frequency cut in multiband code

Created by: alextoub7

For a given time to coalescence, specified by "t0_geocenter", the signal is generated up to the maximum frequency of LISA, independently of the observation time, specified by "tend_lisa". This was not the case before, I have added the high frequency cut by hand in own branch.

However, when setting tc<=tobs, I get an error message:

"Warning in PrintCheck (lisabeta/struct/struct.c:136): Reached higher than peak frequency, where tf becomes unreliable. ValueError Exception ignored in: 'lisabeta.waveforms.bbh.pyIMRPhenomD.check_error' ValueError: Invalid input value error in BuildFrequencyGrid (lisabeta/tools/tools.c:280): Input freq limits do not verify f_min < f_max."