#1355: This commit looks scarier than it really is for this ticket.  Displays each photo's tags beneath the 
title, and can be toggled on and off.  Changed the name of the checkerboard item object (been meaning to do that 
for some time), which is a lot of the diffs.  Also added a mechanism for setting properties on an entire 
ViewCollection, which is a more centralized system than the way we were toggling title and thumbnail size 
before.