* mouse.el: Begin adapting this to the new event format.
(event-window, event-point, mouse-coords, mouse-timestamp):
Removed.
(event-start, event-end, posn-window, posn-point, posn-col-row,
posn-timestamp): New accessors; these are defsubsts.
(mouse-delete-window, mouse-delete-other-windows,
mouse-split-window-vertically, mouse-set-point): Rewritten to use
the new accessors.
* mouse.el: Remove hack of binding down-mouse-1.
* mouse.el (mouse-movement-p): Add docstring for this.