made changes to use V1 data and bayestar skymap in py3

changes in rapid_pe/lalsimutils.py to use Virgo data.

Changes in bin/rapidpe_integrate_extrinsic_likelihood and rapid_pe/mcsampler.py to use bayestar skymap in py3.

Here is a table comparing the skymap produced by RapidPE with and without the Bayestar skymap. skymap1 is low resolution compared to skymap2. Also, skymap2 uses a smaller smoothing parameter in creating the plots.

Event	RapidPE skymap with Bayestar	RapidPE skymap without Bayestar	GraceDB skymap
S190408an	skymap1, skymap2	skymap1, skymap2	GraceDB
S191222n	skymap1, skymap2	skymap1, skymap2	GraceDB
S200115j	skymap1, skymap2	skymap1, skymap2	GraceDB