including:
- allowedDescendantStepTypes property on workflowStepType
- add workflow-level validator
- new field in WorkflowStepOutput to indicate that a step within a multi-forking execution should terminate the entire workflow.
- allow null toStep to be stored in a link, to help track flow out of variable steps at end-of-graph
- replace GetWorkflowStepSummaryProcess with GetWorkflowStepDynamicValuesProcess, which also includes outboundLinkOptions for VARIABLE mode steps
Darin Kelkhoff