translate workflow resources to flow fom
handle workflows passed in as xml file paths
Allow empty inputs/outputs in database

The new flow system's historian will not be setting these fields.
Save workflow plan before running Flow::run_workflow
send xml_text to OLTP rather than a hash
let a workflow command be dynamically generated class
Merge branch 'master' of ssh://git/srv/git/workflow
handle single op workflows for flow submission
be more careful when checking values in input hash
pre-fix for dependency on UR bug

This currently depends on a bug in UR that will soon be fixed and will
then need to fall back onto Workflow::DataSource::InstanceSchema as a
consequence of our Postgres/Oracle syncing.
Let resource checks go through the instance before falling through to the type.  The adaptor for commands supports resolve_resource_requirements(), which can return either a string or object.
Merge branch 'master' of ssh://git/srv/git/workflow
wrap simple (single op) workflows in models when using flow
make run_workflow respect WF_USE_FLOW
restored rusage to use comma-delimited elements intead of multiple rusage elements
Merge branch 'master' into gms-host