Adds String.truncate and default description support in for search_indexes.
Adds support for filtering categories in search_index.
Adds AutoComplete.js, including some tests and styles
Removes useless index on search_index and backwards compatibility (temporarily) for numeric rights.
Adds adding users and groups on AdvancedObjectRights dialog, using AutoComplete.js.
Fixes bug in DbObject.rights_hash_to_int, when hsh = nil.
Adds simple rights controls.
Changed sass build output from compact to compressed.