Use absolute paths in addremove.
This is more consistent with other places in the code, which only use
the "relpath" returned by cmdutil.walk for display purposes.
0 files updated, 0 files merged, 1 files removed, 0 files unresolved
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
(branch merge, don't forget to commit)