QuickMessage:  Better 'Mark as read' handling

Allow for marking messages 'Read' when the pop-up is enabled. When the
thread a marked read, the matching message pages will be removed from the
pop-up, leaving any unread messages in place.  If all messages are marked
read from the notification, the pop-up is dismissed.

Change-Id: I597ba30e0f2a09626bfdd9257aa7be98623e0d73

Conflicts:
	src/com/android/mms/quickmessage/QmMarkRead.java