merge: better error messages to lead users to hg update --clean to abandon merges.
Fixes issue1533.
[ original upstream description ]
--- a/tests/test-keyword.out Sat Jan 03 17:15:21 2009 +0100
+++ b/tests/test-keyword.out Wed Mar 04 13:06:16 2009 -0600
@@ -458,7 +458,7 @@
warning: conflicts during merge.
merging m failed!
0 files updated, 0 files merged, 0 files removed, 1 files unresolved
-use 'hg resolve' to retry unresolved file merges
+use 'hg resolve' to retry unresolved file merges or 'hg up --clean' to abandon
% keyword stays outside conflict zone
$Id$
<<<<<<< local