Update screenshot
Allow overriding of top/bottom offset in affix
Allow a custom subtitle in ContentHeader

Now you can pass a custom string to be rendered as subtitle, e.g.:

<% include ContentHeader subtitle=$MetaDescription %>
Modularize results page

Split the template in several subtemplates, in a similar way of what
done for the standard page.

Furthermore, improved consistency with Page.ss, e.g. rendered the title
in Page_results.ss using the same markup of Page.ss.
Merge branch 'dev'