Fix some docopt usage patterns
gls and bls both work with bis

There is a new option for per to calculate the periodogram of the
CCF Bisector Inverse Slope. But with the bls this is still not
working correclty because of the frequency sampling calculation.
Keep extras full set; but this needs work
restrict now changes extras arrays, but needs testing, is it efficient\?
improve SNR calculation in bls when considering bis
minor changes in dawson fabrycky routine
implements fwhm periodograms
Merge branch 'feature/PerOtherQuantities' into develop
some verbose output in read