resize Handler for the world
fix the world-status info
don't set position of objects we're dragging
fixes for world mouse pos, sceneviewer visibility
unrelated: fix link updating
actually replace link in frontend

otherwise a redraw because of different weight/certainty etc will not update the model
fix scene-viewer visibility
world: selection for objects, editform for objects
Merge branch 'master' into improve_world_ui
deletion for worldobjects
fix for newObjectForm
Fixes for link_reciprocal
sprinkle mode for adding worldobjects
raster don't really work
better hit testing
load worldobjects from server
improve add object mode
keep object orientation at new position after manual move.
editing worldobjects disabled ftm
fixes the Braitenberg's movement behavior.