Moved Sql and Database.php to remote project
Added :like and :dislike search aliases
Added special:fav search aliases

It displays favorites of user currently logged in.
Fixed obscure search alias bug

When trying to search for hidden or disliked posts, it was impossible to search
by any aliases because of some hardcoded stuff. This commit removes the
hardcoded part altogether and fixes aliases support for these search terms.
Merge remote-tracking branch 'upstream/master'