Self-test added, interfaces/classes extended:

Self-test added, interfaces/classes extended:
- Self-test task HubSelfConnectTask added which should connect to public IP
  number for checking if we are reachable from outside
- Interface Connectable extended with method processAllPendingQueries()
- Template for tasks extended with Taskable interface implementation
- Attribute listInstance from two (!) base classes move to core
- Type-hints from IteratorAggregate changed to our own Listable interface
- Method visitQuery() added to visitor ActiveTaskVisitor
- Template for query connector classes extended to match against latest changes
  in Connectable interface
- Configureable iterator added to LocalQueryConnector
- Template for query classes extended with Visitable interface
- LocalQuery extended with same interface
- Missing configuration entries added