Making sure overlap check counter is initialized if a plot requests that overlaps be drawn.
Making sure overlap check counter is initialized if a plot requests that overlaps be drawn.

shikhar413/openmc,liangjg/openmc,liangjg/openmc,shikhar413/openmc,walshjon/openmc,smharper/openmc,mit-crpg/openmc,mit-crpg/openmc,walshjon/openmc,amandalund/openmc,smharper/openmc,smharper/openmc,shikhar413/openmc,amandalund/openmc,amandalund/openmc,mit-crpg/openmc,liangjg/openmc,walshjon/openmc,paulromano/openmc,smharper/openmc,liangjg/openmc,shikhar413/openmc,amandalund/openmc,walshjon/openmc,mit-crpg/openmc,paulromano/openmc,paulromano/openmc,paulromano/openmc