Allow users to edit

[sternwake]

I've also seen the mayhem caused by those who know they can come back and change whatever they wrote whenever. The ' post modified by xxxx at such and such a time' can help somewhat, but trolls be trolls and a 30 minute window is fine with me.

Although I have begun editing at minute 25 and clicked save changes at minute 31 only to be denied. A few curses and Oh well.