* [pycbc_live] Simplify and fix how CLI options are passed to the SNR optimizer (#4628)

* adding non-optimizer specific options to args_to_string

* correct formatting

* simplifying if snr opt seed

* Adding extra-opts arg

* updating options in live example run.sh

* restoring deleted space

* removing redundant default

* moving all snr optimizer options to snr_opt_extra_opts

* updating argument help descriptions

* removing snr_opt options from pycbc live

* removing seed option from example

* removing args_to_string

* Actually, even simpler

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Co-authored-by: Tito Dal Canton <tito.dalcanton@ijclab.in2p3.fr>

* Stop testing on Python 3.7 (#4469)

* Bug: Live combine fits, different bin edge sizes causes an error (#4636)

* Update pycbc_live_combine_single_fits

* logging warn -> warning deprecation

* Improve how pycbc_live handles localization-only detectors (#4635)

* Improve how pycbc_live handles localization-only detectors

LOD = localization-only detectors

* Do not initialize single-detector FAR estimators for LOD
* Only use triggering detectors for PSD var statistic
* Correct the GraceDB annotation to explain which detectors
  contributed to the FAR and list the LOD
* Only list triggering detectors in background dump filename
* Code reformatting

* Fixes

* Fixes

* Use attributes of event manager instead

* Improve GraceDB annotation

* Fix

* Ignore loc-only detectors for rank > 0

* Further clarify which detectors are used only for localization

* Main loop should go through the loc-only detectors only in rank 0

* Fix comment bugs in #4635 (#4645)

* Set version to 2.1.5

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Co-authored-by: Arthur Tolley <32394213+ArthurTolley@users.noreply.github.com>
Co-authored-by: Gareth S Cabourn Davies <gareth.cabourndavies@ligo.org>