Bug fixed: Rounded values in order to match the production.

The method that finds out the signal level that shoud adopt a producer
now uses rounded values. In other way, it is possible that the
'confirmed' production never matchs up with the 'offered' production.
Removed the Aspem02 from the TestExp03.

The Aspem02 was never used in the TestExp03. All the code related to
this ASPEM (initialization and finialization) is removed from the tests.
Bug fixed: Prosumers cannot produce for themselves.

Before this fix, Prosumers tried to contact themselves as possible
producers to meet their own demand. It was wrong. A node can never
satisfy its own demand.
Configuration object allows to set properties.

With this new feature, other modules can override dynamically the
configuration options of the EnergyAgents module.