BibFormat: display the right icon/thumbnail

 * Amends the correspoding bibformat elements
   to display the right icon/thumbnail in both,
   the brief and the detailed view of a record.
 * Gives new style to these icons/thumbnails, and
   makes them clickable.
 * Adds new output format called 'HNP' to display
   the 'New publications'.
 * Opens 'Fulltext' url in a new tab.
 * Adds error checking to the template context
   function corresponding to the 'back-to-search-links'
   feature to check if the input recid belogs to
   the input list of recids.