Decided not to rename Stack to Box because Box means a lot of different things; described problems with that in futureplans.md.
Removed kVK_ANSI_KeypadClear from events_darwin.go; this is a holdover from early Mac keyboards that had a Clear key where Num Lock is on an IBM keyboard (for example, http://upload.wikimedia.org/wikipedia/commons/4/4e/Apple_Macintosh_Plus_Extended_Keyboard.jpg (via Psy| in irc.freenode.net/#macdev)) and is irrelevant to our usage.
Changed Unix Area WM_ACTIVATE equivalent handling to use enter-notify-event and leave-notify-event instead of focus-in-event and focus-out-event as suggested by tristan in irc.gimp.net/#gtk+.
Verified the previous commit.