Absolute URLs for links appearing in feed

note that this changes the oft-used byline()
Issue 1859: Challenge settings don't catch contradictory dates
Issue 1859: Challenge settings don't catch contradictory dates
simplified
simplified
simplified
simplified
simplified
simplified
simplified
simplified
simplified
simplified
simplified
fix unsubscribe redirect
redirect to proper location
Fix HTML relatd to LiveValidation on Support and Abuse forms
New invalid message style for LiveValidation
Rearrange styles so we don't see strange things when LiveValidation fields are filled in correctly (we don't do success messages)
Add asterisk to indicate required field on Known Issue form