Update PyGRB Workflow Generation

[jakeb245]

Lots of work has been done on the PyGRB pipeline, but the workflow generation script hasn't been updated in 3 years! It is quite out of date with rest of the pipeline and PyCBC as a whole. Work is being done to bring the workflow generation up to date in this branch. Any discussion, advice, etc. is welcome!

Things done so far:

• Updated segment generation to work with current PyCBC modules
• Updated workflow to successfully run pycbc_multi_inspiral (that is: a run with pycbc_hdf5_splitbank and pycbc_multi_inspiral as executables)
• Various fixes along the way to make the above things work

Things to do:

• Reimplement injections, time slides, and post-processing with updated code
• Either reimplement gating in workflow generation or move gating into workflow
• Keep workflow up to date with current development
• Move some LAL dependent files around in the GRB utilities code
• Fix bugs!

[ahnitz]

@jakeb245 Once this is complete, I might suggest adding a unittest similar to what we have for the coincident search workflow (i.e. a full run of some analysis but with settings to bring the runtime to ~ 30 minutes). That way we can prevent anyone breaking the pipeline and if changes are needed they have to be reflected there too.

[pannarale]

I'm closing this issue as it is superseded by #4288 (and future PRs that will follow it).