aggregator execs + ll_inspiral_pipe: allow more control with number of routes processed per job, increase number of aggregator jobs in online dag for scalability

gstlal_ll_inspiral_pipe: rename output dir for gstlal_ll_dq for consistency, create multiple gstlal_ll_inspiral_state jobs to handle aggregation better

gstlal_compute_strain:  Use lal_matrixsolver to read in multiple channels for power lines subtraction.

- 14cf8072 introduced a ln L offset for singles but put it into the numerator.  that is not allowed:  the numerator (and the denominator) must be the *real* distribution density for signal (and noise) candidates, we rely on that being true for astrophysical rate estimation (and false-alarm probability measurement).  ranking statistic hacks go into the ranking statistic, which we define based on these two PDFs in far.py

- make the exclusion of sub-threshold triggers from the kwargs_from_triggers() method permanent, and put an assert into .__call__() to make sure no sub-threshold SNRs leak in.

Updates to some of the testing directories.  Bug fix for calibration state vector calculation related to how HW injection bits are set with new CAL-INJ model logic.

gstlal_compute_strain:  If using actuation pcal line for SRC detuning, still subtract PCAL_LINE4 if necessary.

gstlal_compute_strain:  added comment explaining backwards-compatible EPICS records in the calibration pipeline.

gstlal_compute_strain:  If using actuation pcal line for SRC detuning parameters, use the corresponding front-end channel to update the frequency.

gstlal-calibration:  Use GstValueArray in some elements rather than GValueArray.  Gets rid of build warnings about deprecated GLib functions.