Add depletion time to io formats
Add depletion time to io formats

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