Make sure EndNote exports have at least one format.
CSS improvement (make feedback tab obviously clickable).
Merge branch 'master' into search-refactor
Don't use query defaults, invariants, appends in update()

* VuFindSearch/Backend/Solr/Connector.php (update): Don't use
  query defaults, invariants, appends.

A/D/I are only used in requests to the `select' query handler.
Update docstring

* VuFindSearch/Backend/Solr/Backend.php (search): Update docstring.
Reduce use of $this->searchTerms.
Fixed template bug that broke blank advanced search form.
Moved display query generation to QueryAdapter.
Moved term containment checking into Query classes.
Eliminated several methods by adding AbstractQuery::getAllTerms().
Less "advanced query" special casing; simpler spellcheck code.
Eliminated obsolete "simple spelling" options.
Eliminated obsolete dictionary methods; fixed comment typo.
Added term replacement to query objects.
Made QueryGroup cloneable.
Added routine to convert VuFind request parameters into Query.
Adjusted comment.
Added missing fixture.
Replaced old searchTerms internal array with Query/QueryGroup objects.
Eliminated obsolete method.