Fix shortcut of Delete function
Pass the graph editor under the viewer

Usefull to drag & drop the mosquito from the viewer
to the node(in the graph editor)
Drag and drop of the mosquito on the nodes
Transform the mosquito in a dragable element
Add new function getCurrentIndex() for the paramChoice

Fix a problem due to "pyside to pyqt" (not totally resolve for the moment)
Fix the drag & drop of the mosquito

in viewerManager.py : the mosquitoDragEvent is not usefull no more
Fix error due to PyQT in Viewer.qml & glviewport.py