#247617 by snoble: add stamp field to workflow_node table for Postgres
added status field to workflow_states table so deleted states are not
  deleted; they are just flagged as deleted. This preserves workflow node
  history even if a state the node has been in is deleted.
workflow tab page now themes current, regular and deleted states differently
#128874 approach by JacobSingh: reassign soon-to-be-orphaned nodes to a
  different state when a state is deleted