* Add aria-label attributes to search form inputs and selects

Guidelines:
WCAG 2.0 A F68
Section 508 1194.22 (n)

* Add title element to FacetList page

Guideline: https://www.w3.org/TR/WCAG20-TECHS/F25.html

* Add aria-label to initial similar items carousel

This widget has a label added by JS after it's clicked, but doesn't start with a label, which
is triggering WCAG 2.0 A F89 failure.

- Works around problems caused by changing record IDs on the Summon side, using the bookmark feature provided by the Summon API
- Includes mechanism for fallback record loading
- Includes mechanisms for deduplication after record ID change

- This makes all scripts more robust and fixes a specific problem with index-alphabetic-browse.sh where it would not resolve VUFIND_HOME correctly when invoked from within the VuFind directory with no environment variable set.

- This corrects a bug that prevented apostrophes from working correctly as thousands separators.

Error description in the Sierra REST API is optional, while name is not, so fall back to name if there's no description. Also use empty() instead if isset() to avoid considering code 0 an error.

A block of HTML is copied to make a template; some of the id elements were being
removed, but 2 were left on causing Lighthouse to complain about
duplicate ids.

SortSite flags "Strong" as invalid markup that could trip up
a screen reader.

SortSite flags "Strong" as invalid markup that could trip up
a screen reader.

- Improves OAI-PMH validation.