Remove unneeded rpn tokens in-place
Remove unneeded rpn tokens in-place

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