first pass at adding facets for language, subject, content type, institution, author and genre
don't display more page links than we have search results for
first pass at facet links
make sure holdings only default of false is at play. fixes #562
Merge pull request #583 from gwu-libraries/t562-refine-query-scoping

make sure holdings only default of false is at play. fixes #562
Merge branch 'm17-integration' into t561-facets
preserving original facet names for use in future facet queries
resolved merge conflict with m17-integration