Remove unnecessary require in CatalogController template
provide more flexibility for determining when to create a new search context
Backport 10e406f1 by adding blacklight_solr and blacklight_solr_config accessors to SolrHelper
Add i18 strings for displaying show and index field labels:

- blacklight.catalog.show.label
- blacklight.catalog.index.label

Backport a599336d8591615d640aece2613f0a9743b7ddae
add #should_show_spellcheck_suggestions? helper
#link_to_previous_search can use regular rails escaping
remove old comment
add deprecation warnings for unused user methods
Deprecate #citation_title helper
add additional hash-like features to Blacklight::OpenStructWithHashAccess

fixes #730
Backport #741, with deprecation warnings for old-style behavior
Merge pull request #742 from projectblacklight/backports-for-4.6

Backports for 4.6