Bug 1679864: added third search option in p&c screen

	- user can search in tags, in title+decription
	  or in title+description+tags
	- the last type of search user chooses will be remembered
	- fixed search for the other options
	- fixed bug when there are same number of collections
	  and pages to display.

behatnotneeded

Change-Id: Ibd206d5ac211893b52b26b7be9582785cbad606e