Make bilby (or bilby_pipe) default PSD creation equivalent to LALInference

We want to (by default) recreate what happens in LALInference for the PSD creation. This might need a combination of changes between bilby and bilby_pipe.

Notes

In !366 (merged) we allowed the PSD to overlap the analysis segment. This takes the PSD duration of data, cuts out the analysis segment, then creates a PSD from the remaining data. As such, if one requests 100s of data for the PSD, one actually gets to use 100 - segment_length s of data.

We could add a catch to actually calc psd_duration + segment_length amount of data which then gets reduced to the proper amount.