added VITAMIN-J-42 to group structures
added VITAMIN-J-42 to group structures

amandalund/openmc,walshjon/openmc,walshjon/openmc,shikhar413/openmc,amandalund/openmc,shikhar413/openmc,amandalund/openmc,shikhar413/openmc,walshjon/openmc,shikhar413/openmc,walshjon/openmc,amandalund/openmc