adjust to item list changes: retrieve necessary data via description
item list: enable listing of unreviewed items, but display warn sign
item list: allow collapsing
add new default.js file for common code

As first steps, instead of several specific calls to
jQueryUI.accordion(), do one call in default.js and
make it class-specific. Add the required class to the
markup. Also, move comment enabling in the new file.

Delete several now obsolete JS files.
merge comments.js into default.js
move items/list to standardized way of non-JS styles
move JS file for login page, fix syntax (was partially PHP)
use external jquery-UI
move form polyfills in one, unconditionally loaded file
Merge branch 'simplify-js'
Merge branch 'master' into stdlib
as done in 28d5413b97, eliminate unused JS file
As done in 348fe48c08, use external jQuery-UI