Sorting docs/eqs (+known issue)

There is currently a known issue with sorting-- if you sort equations
by "Recent", then choose a new document, the new list of equations is
still sorted by name, but the Recent button is active. Then to sort by
most recent, you have to press "Name" first, then "Recent". Currently
working on fixing this.

Also in this checkin:
- making equation info go away when a new doc is selected
- scrolling (needs to be tested on server)
- doc.eq