Contacts: Modifications for using categories.

apps/contacts/ajax/categories/add.php

apps/contacts/ajax/saveproperty.php

apps/contacts/css/contacts.css

apps/contacts/index.php

apps/contacts/js/contacts.js

apps/contacts/js/jquery.multi-autocomplete.js

apps/contacts/lib/vcard.php

apps/contacts/templates/index.php

apps/contacts/templates/part.contact.php

lib/vcategories.php