Year filters and database constrance

@tilius 
i accidently close previous PR, and i do not know how to reopen it

>Entered /lists/authors and selected test2 as Journal. Then tried to input 2013 - got "please choose value GREATER then 2014". Tried in turn to input 2015 - got "please choose value LESS then 2014" ;) Could you fix it? Maybe we'd better resign from the front-end year validation in the filters at all?

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