Adding a new version of the bee agents that works:
* [DH_AGENT,EXT] Add the initialization argument to the thread exit predicate of an agent.
* [DH_AGENT_FORAGER,NEW] Reimplementation of the forager bee agent, using search i.o. deduction and aging.
* [DH_AGENT_SCOUT,New] Reimplementation of the scout bee agent, using search i.o. deduction and aging.
* [DH_SEARCH,NEW] New module implementing a new type of action. Currently search for instance of a given RDFS class can be performed. The number of search results are counter per agent.