gstlal-calibration: New pipeline gstlal_compute_kappas which only computes...

gstlal-calibration:  New pipeline gstlal_compute_kappas which only computes the kappas (much cheaper than computing h(t)). It can also apply a filter to DARM_ERR to simulate the effect of time-dependent correction factors (\kappa_tst, \kappa_pu, \kappa_c, f_cc, f_s, Q), so that tests can be done quickly.