TPAC: Make facet display work as in JSPAC

TPAC: Make facet display work as in JSPAC

Namely, this means:
    - You see five facets per category by default, not ten.
    - You can click a link to see all the facets in a category
        (before this it was impossible to display more than ten).
    - When viewing all the facets in a category, you can click a link
        to reduce the list back to five.
    - This number five I'm talking about is configurable in config.tt2.
    - Alphabetical sorting of facets grouped by the same numbers of
      results is restored.

This addresses LP #1065109.

Signed-off-by: Lebbeous Fogle-Weekley <lebbeous@esilibrary.com>