Set/GetParameters functions removed from ToolInterface. onUpdatingParameter function modified accordingly to get access to the UIParamSet of the current tool.

GLViewer::updateDisplayable() function modified so as to give the possibility to choose which data must be effectively updated (the whole displayable, selection managers, bounding box or transform).

Only objects whose DisplayableInterface::isGrabbable() function returns true can be moved that way.
If grabbing is validated, the new transformation is notified to the DisplayableInterface through onUpdatingTransformation() function.

Bug fixed in the reinitialization of the GLViewer when a project is created/opened or when the last project has been closed.

GLViewer::renderCoords() renamed to GLViewer::screenCoords() and GLViewer::renderText() function made more flexible.

GLViewer::reframedProjection function now use near and far planes extracted from the projection matrix itself instead of zNear() and zFar().

Possibility added to GLViewer to set a suffix to the metric grid (for instance, to specify a length unit).