Show all holdings.

Attached a class to the <li> tag instead to indicate availability.
The theme can choose to hide it, if it wants to.
Don't sort the years ascending.

It makes more sense to have the newest years first instead of having the user scroll down the page to find the newest.
Also, it avoids wasting time on unnecessary sorting.
Merge branch 'nosort' into merge
Merge branch 'holdings' into merge