DeleteAction() Deletes the selected events from the calendar.
The selected checkbox value is a combination of event UID & RID (if recurring) and this
is returned as ArrayList.
Deletes the selected events from the calendar.
The selected checkbox value is a combination of event UID & RID (if recurring) and this
is returned as ArrayList.
This ArayList is used for deletion.
An error should be reported if any of the selected events could not be deleted.
However, the processing is not stopped until all the selected events are attempted to
deletion.