Interface for execution state
Avoid concurrent modification exception when serializing parameterized
states
Use hasExecutionState interface
Use synchronized map
State changes for parameterized steps reflected in owner step

* Correctly updates node state
Update tests: Exception is not thrown for ignored state change

error handler state changes allowed
Test node step sub workflows
Node summary duration ignores parameterized steps
Summarized node step info fixed
Pending steps calculated per-node
Debug logging of state changes in dev mode
Merge pull request #930 from gschueler/issues/861-ui-job-status-nodestep-jobref

Fix incorrect UI for parallel node step job reference Workflow state view fixes #861