Fix copy detection corner case We were aborting if the copied from rev was before the cut-off limit, rather than the copied _to_ rev. The copied from rev can be arbitrarily old.

#!/bin/sh
# http://www.selenic.com/mercurial/bts/issue433

hg init a
cd a       
echo a > a 
hg commit -Ama 

hg parents -r 0 doesnotexist
true