First prototype of higher order tasks.
Added more debugging strategies.
relation-try-term-to-uri does not insert unrelated tasks any more.
Simplified relation match task creation.
Added relation distance calculation task.
Added sum task.
Integrate higher order tasks into task evaluation.
Fix uri retrieval for relations.
Add debugging strategies that strip annotations.
Merge branch 'master' into higher-order-tasks
Merge branch 'master' into higher-order-tasks
Print error if delaying a task with 0 dependencies.
Fix several bugs with higher order tasks.
Implement garbage collection of higher order tasks.
Fix warning.
Persist overridden instruction.
Requeue task even if no higher-order tasks have been added.
Cleanup.
Fix TermTools.makeList creating a reversed list.
Merge branch 'higher-order-tasks'