- not just the ones for which there are gates (i.e., also instruments that
  are in the network being analyzed but that might not be providing any
  data for this particular job)

gstlal_inspiral: allow both a reference likelihood file and a regular likelihood file in order to assign offline LRs

gstlal_ll_inspiral_create_prior_diststats: make writing a file for each bin and a cache file optional.  This way we can just write a single file for the entire offline reference

- use to define the instruments for the analysis

match convention in rest of dag

- plot VT on log scales
- fix a bunch of latex typesetting issues
- "fix" (= make the way Kipp likes) the aspect ratios of plots
- "fix" (= make the way Kipp likes) the area covered by the axes (use .tight_layout())
- pi != 3.14 (W.T.F.!  seriously, WTF?)

far.py: only extinct the combined pdf for now.  With single ifo searches there is too great a chance to have unresolved individual pdfs.  We don't use the extincted version of the individual pdfs anyway

gstlal_ll_inspiral_create_prior_diststats: fix some typos from last commit and remove unused background prior options