Account for 'ftn' as an MPI wrapper since it is common on Cray systems
Account for 'ftn' as an MPI wrapper since it is common on Cray systems

liangjg/openmc,smharper/openmc,wbinventor/openmc,liangjg/openmc,johnnyliu27/openmc,smharper/openmc,shikhar413/openmc,paulromano/openmc,shikhar413/openmc,shikhar413/openmc,wbinventor/openmc,smharper/openmc,walshjon/openmc,mit-crpg/openmc,amandalund/openmc,mit-crpg/openmc,amandalund/openmc,walshjon/openmc,paulromano/openmc,wbinventor/openmc,johnnyliu27/openmc,shikhar413/openmc,mit-crpg/openmc,liangjg/openmc,johnnyliu27/openmc,mit-crpg/openmc,walshjon/openmc,johnnyliu27/openmc,smharper/openmc,amandalund/openmc,walshjon/openmc,amandalund/openmc,paulromano/openmc,liangjg/openmc,wbinventor/openmc,paulromano/openmc