Move the truncate() method into ApplicationHelper.
Move another method around, for no particularly
good reason. Controllers really shouldn't have
public methods that don't correspond to actions.
Should be to the published action. This
didn't work right for inter-web links.
(Reported by Mike Shulman)
Also, change some .length's to .size's
(for Andrew Stacey)
From Jason Blevins:
Create a "History" page for each wiki page.
Link to it, and to the "Diff" page from "Recently Revised".
Also, correct a bug in listing/deleting links to uploaded
video and audio files.
