Bug 8241 - Remove stray references to YUI autocomplete

Bug 8241 - Remove stray references to YUI autocomplete

- Removing unused references to YUI assets in authorities/auth_finder.tt
- Removing unneeded call to autocomplete JS in help-top.inc and
  adding new jQuery dependencies.
- Minor HTML markup corrections to auth-finder-search.inc discovered
  in debugging the patch.

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Tested:
- help files on various pages
- auth finder plugin in cataloguing
- authority search in authorities module