removed coefficient caching
removed coefficient caching

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