CMW rootNode must redraw onmouseup to arrange all windows properly in all situations.  This partially reverts
CMW rootNode must redraw onmouseup to arrange all windows properly in all
situations.  This partially reverts

d85e0c7d8f61bd071720be34fdf4236f6a49d489

onmouseup should only be sent after dragging a window---tools should not
propagate the event into the window's event catcher---we need to fix
overzealous redrawing there.

fzadow/CATMAID,htem/CATMAID,fzadow/CATMAID,fzadow/CATMAID,fzadow/CATMAID,htem/CATMAID,htem/CATMAID,htem/CATMAID