Get hydraulic results from simulation
Wrap epanet structures into another objects

New wrappers classess for the epanet structure objects (pipe, reservoir
junction) have been created trying to isolate gvSIG code from Baseform
code.

A Factory for creating the links structures have also been created
Refactoring to remove a useless methods
Creates junctions and reservoirs objects with a factory
Creates tanks objects with a factory
Use the same code structure for valves

A class to wrap valve structures has been created and it is instantiated
by means of a factory

Also, a new Map to handle aux nodes, those that encloses a valve or a pump has been defined. Those nodes are added to the Network in the prepare() method. That is a "just in time" strategy.