Tags are now cached locally

To increase speed tags are now cached locally. In the past for every character you entered into the tags field, there was an AJAX request to our server to get the matching tags from the database. We changed this and cache tags locally on your machine now. So when you want to tag a collection now the completition is done via javascript by your browser, what should be much, much faster than a request to our server! We also cleaned the tags database and removed around 700 pointless tags. Once again: Please remember to separate your tags by a comma! A space is not a separator!