Disallow export_to_hdf5() when data came from ENDF
Disallow export_to_hdf5() when data came from ENDF

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