CAL-801 js send request to much when drag drop event

Fix description:
- catch only PathNotFoundException
- use off('mousedown') method before adding new on('mousedown')
CAL-529 Fixed resizing event in week and day view

Fix description: Fix resizing event in javascript of week view and day view.
CAL-787 CLONE - Not show warning message, or show event on working pane if event is repeated by past time

Fix description: Show warning message if event is repeated by past time.