Kill models getName() call sites.

Kill models getName() call sites.

- Debug messages now depend on typeid(...).name(). Beware, the output
  may be compiler dependent.
- It was mainly used to have a specific handling of NS3, which method
  shareRessources() is not idempotent (ie, it actually moves the model
  in the future with no possibility of rolling it back afterward).

  So NS3->shareRessource() needs to be run after all other
  shareRessources, and before the updateState()s.

  Add a shareResourcesIsIdempotent() method to all models to detect
  whether we need to activate that strange behavior without having to
  rely on the model name.

- Removing models namesmakes Model pure virtual, possibly allowing
  diamon-shaped inheritance in L07, where we need only one model for
  CpuModel and NetworkModel.