Optionally dedup Snippets, such that words will only be bound to one sni...

...ppet.

OnTime: #1332 HOCR Bounding Box "Deduplication"

This is achieved by adding an additional default parameter to the solr results
function, that defaults to bounding a word to only a single snippet.

Also includes: https://github.com/Islandora/islandora_paged_content/pull/16