reorganized some "Displaying..." templating
added sort by setting to unitid and date Indexes
enabled ResultSet ordering by Index (CQL name)
sort by title uses Index rather than XPath

This is both more efficient and more accurate.
respect selected maximumRecords when sorting results
respect existing sort order when selecting maximumRecords
summary links uses sortByString to respect sort order
respect sort order when navigating paginated results
sort by date uses Index rather than XPath
sort by reference uses Index rather than XPath
enabled sort by creator
changed default sort order for browse and subject searches

Changed default result sort order to sort by title for searches
that originated from a link in browse or subject finder results.
These are 'exact' searches for which relevance sort order makes
little sense.
+speed, +func: enhanced and optimized result sorting

Merge branch 'feature/sort' into develop