Issue 408 - add file line number to search suggestion

Created by: maxhallinan

When a user searches for filename:123 and there is one suggested file, then the suggestion links to that file at line 123. More discussion about this feature is found on issue #408. There is no change to the behavior of the search page except that a search for filename:123 is now implicitly a search for filename. :123 is removed from the query by the frontend.