ac-js

- Corrected the link generation for autocomplete/search entries in case of @use chaining and made them location-independent - Removed an superfluous div-closing tag in class.html.tmpl - Refactored the backend code for the auto-completion search box, separating the concerns of rendering the JS array of hashes and serialising entities into a dict representation. The latter allows to discriminate entity-specific rendering behaviour (together with the mixin layer facility). - Added the entity type (its pretty name) to the search results presented to the doc user. - Removed the unwanted "::"s from @project and @package names.