Corrects the way to open the selected GE configurationPanel,
A double click on a GE open the configurationPanel of this GE,
Click on the 'configurationPanel' button open the panel to configure all the selected GE,
Now a GE cannot be selected more than once.
Fix the configuration of a selection of GE, it was configuring only the first selected one.
Reenable the configuration on creating a GE.
Unselect all the GE on clicking in the void.