Use superevent skymap for skymap comparison if from superevent IGWN alert; Fixes #598
This MR will always make sure that we are grabbing skymap information from superevent after IGWN alert is issued when skymap is added to a superevent.
This MR will always make sure that we are grabbing skymap information from superevent after IGWN alert is issued when skymap is added to a superevent.