Formatter/searchbar: formatter templates modularisation and permanent searchbar basements

* Default_HTML_detailed_base.tpl, Default_HTML_brief_base.tpl created as base templates
* templates/search/searchbar_frame.html is a template with searchbar only
* Bibfield parser exceptions handling improvements

Reviewed-by: Javier Martin Montull <javier.martin.montull@cern.ch>