LP2009865 Heading tags for catalog search results

LP2009865 Heading tags for catalog search results

Alters the markup of the search results list to use <h3> for the title
and <h4> for the author. To keep the heading outline in the correct
order, this also changes the "Search Results (N)" heading from <h3> to
<h2>.

In conjunction with the fix for Bug #1994711, this produces the
following page outline:

h1. Staff Catalog
h2. Search Results (N)
(repeat for each result:)
h3. [Title]
h4. [Author]
(repeat for each facet box:)
h4. [Facet title]

The facet headings should probably be adjusted separately.

Signed-off-by: Stephanie Leary <stephanie.leary@equinoxoli.org>