LP#1424815: 'Read more' accordion in record view

LP#1424815: 'Read more' accordion in record view

- Introduce custom accordion.JS to handle expand/truncation of
node information.
- Expansion/Truncation of individual nodes based on configurable
length.
- Refactor content.tt2 to properly display multiple notes with both
Read More and Highlighting features.
- Create accordion() macro in summary.tt2 to handle accordion-izing
a string when also supplied with a length, display field string,
and an optional highlighting boolean.
- Implementation of config.tt2 variables to handle enabling and length
requirements for truncation.
- Apply Read More to record Title as well as item details and graphics
text on record and search results.
- Teach Accordion functionality to understand blocks of HTML
- Add release notes for Read More functionality.

Signed-off-by: Kyle Huckins <khuckins@catalyte.io>
 Changes to be committed:
	modified:   Open-ILS/src/perlmods/lib/OpenILS/WWW/EGCatLoader/Util.pm
	modified:   Open-ILS/src/templates/opac/css/style.css.tt2
	modified:   Open-ILS/src/templates/opac/i18n_strings.tt2
	modified:   Open-ILS/src/templates/opac/parts/config.tt2
	modified:   Open-ILS/src/templates/opac/parts/js.tt2
	modified:   Open-ILS/src/templates/opac/parts/misc_util.tt2
	modified:   Open-ILS/src/templates/opac/parts/record/authors.tt2
	modified:   Open-ILS/src/templates/opac/parts/record/contents.tt2
	modified:   Open-ILS/src/templates/opac/parts/record/summary.tt2
	modified:   Open-ILS/src/templates/opac/parts/result/table.tt2
	new file:   Open-ILS/web/js/ui/default/opac/accordion.js
	new file:   docs/RELEASE_NOTES_NEXT/OPAC/read-more-feature.adoc