Add a serialization attribute to Source
Add a serialization attribute to Source

Adds serialization as an optional attribute to Source objects.
This attribute represents the path to the file containing the serialized
representation of the source.

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