DUNE/Tasks: added support for reserving an entity using an Entity object.
DUNE/Tasks: added operator== to Entity for both label (string) and id (unsigned integer).
DUNE/Tasks: added dispatch and dispatchReply member functions to the Entity class.
Simulators/Leaks: use Entity objects for managing secondary entities.
Config: auv/simulator: increased Simulators/Leak debug level to Spew.