Add pandas as an optional dependency
Add pandas as an optional dependency

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