- gstlal_inspiral and gstlal_inspiral_calc_likelihood's process_params rows
  are corrupted by the way the command line parsing code collates user
  input
- snapshot the options object before screwing with it, make sure to save a
  copy and not just a reference
- also fix some whitespace while we're at it.
- refs #2584

- and set to 0
- also instead of implementing the mixing in the probability density
  evaluation functions, have the .finish() method simply construct exactly
  the desired PDFs.  this increases the LR evaluation performance, and also
  ensures that plots of the PDFs show the correct structure
- refs #2583

- to emulate old behaviour and fix the plots generated by plot_background
- add FIXMEs describing future work to remove the count-of-zero-lag from this program altogether so that it need not be a source of this information for, say, plot_background

remove bin-by-aligned-spin option to plot_sensitivity. this option can
break things if the injections don't have spin. this should be fixed
in plot_sensitivity, but for now we just disable the feature here to
prevent dags from crashing.

- from singles that participate in coincs so that they can be overlayed on contour plots if desired.
- this patch does not add them to plots, that will be separate patch

- don't split out lists of (ln L, fap) pairs by instrument combo, just collect as single lists

- make bin density uniform in log up to SNRs of 1000

- disregard min value of zero-lag curve if provided.

- from 100 to 40

- the patch 753825e5 factored part of fap_after_trials() out into the function poisson_not_0() which is vectoried and so returns an array object.  this makes fap_after_trials() sometimes return float and sometimes return an array depending on which internal code path is followed.  this patch fixes.

- optionally
- refs #2555