New {% block %} in search_details
<hr> css applies to all <hr>
get_range()  added to common_filters.py
Moving tablesorter.js and quicksearch.js UP to search.html

These were previously being loaded on every search, since they were linked in the search
results. Now they are in the search container page, so are only loaded once.
Merge pull request #902 from will-moore/searcher_hooks

Searcher hooks