Enhance Start Workflow action to handle running instances
The behaviour of the Start Workflow action is to suspend the originating workflow if an instance of the called workflow already exists for the list item.
Proposed is an enhancement to either:
1. allow the Start Workflow action to be configured such that the originating workflow is allowed to continue
2. introduce a 'Check Workflow' action that returns a value to indicate if if an instance of a workflow exists for a list item