gstlal_inspiral_create_prior_diststats: remove chads mass mode file in favor of Heather's population model file

inspiral_lr: remove chads mass mode file in favor of Heather's population model file.  Additionally make sure that the iadd method can handle situations where not all objects have a population model specified, but force them to be the same if they do

gstlal-calibration/tests/check_calibration:  Improvements to pcal2darm_timeseries.py and plot_transfer_function.py

gstlal-calibration/tests/check_calibration/pcal2darm_timeseries.py:  Plot all timeseries on one figure. Improved formatting

gstlal-calibration/tests:  pcal2darm_timeseries.py:  Can now read from multiple calibrated frame cache files to compare different calibrations.

gstlal-calibration:  config files for comparing results for correcting for only kappas, f_cc, and all TDCF corrections.

- following input from Steffen

- update gsl dependencies for Debian following input from Steffen.

gstlal-calibration:  Update gstlal-calibration.spec.in and debian/gstlal-calibration.install to package everything we need.

inspiral_lr.py: remove the hardcoded 150 for horizon distance normalization and make a module level symbol