Make advanced search use autocomplete result

[mo-nathan]

Currently if you enter "Nathan Wilson" into the advanced search auto-completer for "Observer", and then select the user "Nathan Wilson (nathan)" rather than only returning observations for user 1, it returns observations for any user whose login contains "nathan". At the moment there are 17 such users who have at least one observation.

The issue is that the "user" name is parsed to extract the login and added to the resulting Query as a "LIKE" SQL search. Ideally it would be added a strict search based on user_id which is provided by the auto-completer.