Completion improvement

Some help is now available in the EMF tree to extend a Fractal definition, to chose the signature of a interface or the java class of a content.

For example if you click on the 'extends' property of a Fractal definition, you can
directly type the name of the Fractal definitions you want to extend, or you can click on the right (...) button which raise a dialog box that allows to brose and select the Fractal definitions.

You can do the same think for the content class :

but also for the Fractal interface signature and the binding client and server interfaces.