have at-entity tasks show up as children (in dynamic queueing context, though still submitted externally which means they will not be run as part of queue), and allow them to have children: improves traceability in GUI when effector methods call other effector methods, they show up as children rather than background tasks (or worse, not even as background tasks); and support setting flags in TaskBuilder
parallel task should not fail if inessential child fails
improve display of task results, catch NPE when switching task contexts, and ensure data is cleared (nulled) for old map entries due to backbone bug (without this, sometimes blockingTask might show up as `TYPEOF undefined` when you inspect its JSON)
include blocking details when waiting for service up to invoke an effector on a child