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

OnTime: #1332 HOCR Bounding Box "Deduplication"

This is achived by adding an additional default parameter to the solr results
function, that defaults to bounding a word to only a single snippet.
Merge pull request #18 from nigelgbanks/7.x-dedup-solr-snippets

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