Attempt to add functionality to use singularity

This mostly follows instructions from computing.docs.ligo.org as the recommended way to maintain stable custom environments over the OSG.

• https://computing.docs.ligo.org/guide/htcondor/credentials/?h=scitok#__tabbed_2_1
• https://computing.docs.ligo.org/guide/htcondor/software/#transfer-singularity

We previously had some singularity support, but it was never well integrated, possibly due to immaturity of the support through HTCondor.

I also made a start on porting some of the additional jobs to use the grid.

TODO:

• check authentication
• write documentation
• run tests
  • comparison for a catalog event - differences likely driven by slight difference in BW PSDs although other than SNRs only L1 time has JS divergence > 1mb (1.08mb)
  • comparison for an online event - the new result has the calibration ingestion fix and so very minor differences are expected, all parameters other than calibration agree at < 2mb in JS divergence
  • without the container in the outer product of with/without file transfer, specifying the conda environment, and specifying the analysis executable and everything worked well