Added the Broker behaviour for Exp01.

Added the behaviours of the brokers for the test Exp01.
 - Added the scenario code to the information passed from the Grid Operator. It is initialized with the StartSimulationBehaviour.
 - Changed the UserPrefs in order for them to include the profile of the easy and hard loads.
 - Added method to the DAO layer that collects all the loads profiles in just one query. There is not need to do one query for each load profile.

TODO: Make tests.