Jibx to sax

Replace JIBX by SAX : 
- The save handler only contains the SAX methods.
- All the GE and CA have two new methods to save and load them.
- Rename all the class Simple***GE into ***GE and remove the previous ***GE (the class duplication was necessary for the JIBX binding)
- Delete all the JIBX files and dependency
- Adapt all the classes to this change (i.e. create a CAFactory).