- and begin hooking up the plumbing for min_instruments
- the instruments are exported via a property, which other code can use
  instead of being provided a separate set of instruments along with the
  CoincParams instance
- add extra safety checks to methods in ThincaCoincParamsDistributions to
  ensure the instrument sets are consistent in various places

- contains SNR pdfs for 1- and 2-instrument candidates collected from the H1,L1 network with equal horizon distances, with 0, 1 or 2 instruments operating

- gather all code related to initialization maintenance and retrieval of
  SNR PDFs into SNRPDF class in inspiral_extrinscs

- remove the code used to populate the cache of PDFs from the two
  create_prior_diststats tools and from calc_rank_pdfs into a new,
  stand-alone tool gstlal_inspiral_make_snr_pdf

- to inspiral_extrinsics module as instruments_rate_given_noise()
- this also fixes a bug in the code used to estimate the number of distinct "bins".  the code was computing the correction by comparing the observed counts to the contents of the .rates attribute of the CoincSynthesizer object instead of the .mean_coinc_count attribute.

- move P_instruments_given_signal() and joint_pdf_of_snrs() from far.py to
  new module

- now that the horizon distances are set to 0 in the histories when the instruments are off, populate_prob_of_instruments_given_signal() no long requires segment lists to do its job

- from method of inspiral.Data to method of lloidparts.Handler
- first step towards recording unlocked stretches as intervals of 0 horizon
  distance, ultimately allowing ranking statistic code to rely exclusively
  on horizon distance history and drop use of segment lists

- move to separate module in gstlal.stats name space
- fix "bounds out of order" with open-ended slices: when open-ended slice is beyond end of the keys currently in the tree
- also make a few adjustments:  use isinstance() to check for slices in NearestLeafTree, check for negative horizon distances in quantize_horizon_distances()
- add .weighted_mean() methods

- move some common general statistics routines from gstlal-inspiral's far.py into the gstlal.stats.__init__ module

4393

gstlal-inspiral/bin/gstlal_bank_splitter: Change naming scheme so T050017
description begins with the bin number
gstlal-inspiral/python/inspiral_pipe.py: Added function that takes a group of
T050017 files and generates a name for the collection of files that follows the
T050017 format.
gstlal-inspiral/bin/gstlal_inspiral_pipe: Took advantage of cache option on
more jobs.

Revert "lloidparts: add drop element back in. FIXME: this unlocks injection pipelines but I have no idea why"

This reverts commit d96e9fc8.

lock-up fixed by c749a20d

- probably still broken though

- it causes lock-ups.  give each orthogonal SNR stream its own segmentsrc and gate

- cache files contain URLs, not paths

- this has been fixed upstream in glue.ligolw

This reverts commit ffbe368d.

lloidparts: add drop element back in. FIXME: this unlocks injection pipelines but I have no idea why