Updating enrivonment handling. Using env block where possible.
Updating enrivonment handling. Using env block where possible.

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