Change default URL of HPP.

Update to modifications in hpp-corbaserver and hpp-manipulation-corba

  - urdf and srdf files are now retrieve by the full filename, not anymore
    with package, modelName, urdfSuffix, srdfSuffix.

 Allow to change joint values from keyboard  + hpp-fcl plugin enhancement.

  - locked joints are handled as numerical constraints.

Fix handling of HPP exceptions + Fix compatibility with Python 3. 

  - trying to load hppmanipulationwidgetsplugin.so when corresponding
    corba servers are not running freezes gepetto-gui.

Reduce differences between basic and manipulation plugin.