#3182 identified 1 source of indeterminacy in the meta_agents code.

However there are 2 more problems with it

1. In create_meta_agent, path 1 there are two more set operations
2. In add_constituting_agents, model.register_agent is called. This is redundand because if you call the __init__ of Agent, this allways ends with calling model.register_agent. Moreover, because oft he indended bugfix for Memory leak in models #3179, this breaks because unique_ids on already existing agents are changed.