firstRunGUI: update presentation message
editorGUI: change background for filename input on new files, so that it's more obvious that the screen has changed; fix a minor graphic glitch.
calendarGUI: use a different background when editing events.
editorGUI: actually fix graphic glitch.
calendarGUI: change event editing background again. The spreadsheets kind of look a like a calendar, maybe it will relate more?
(ok, I should probably start to think before I commit)
Group frequent code lines, reducing the binary size.