tag: use an abort hint

mercurial/localrepo.py

@@ -576,8 +576,8 b' class localrepository(object):'
         if not local:
             m = matchmod.exact(self.root, '', ['.hgtags'])
             if util.any(self.status(match=m, unknown=True, ignored=True)):
-                raise util.Abort(_('working copy of .hgtags is changed '
-                                   '(please commit .hgtags manually)'))
+                raise util.Abort(_('working copy of .hgtags is changed'),
+                                 hint=_('please commit .hgtags manually'))
 
         self.tags() # instantiate the cache
         self._tag(names, node, message, local, user, date, editor=editor)

tests/test-tag.t

@@ -36,7 +36,8 b' specified)'
 
   $ echo foo >> .hgtags
   $ hg tag "bleah2"
-  abort: working copy of .hgtags is changed (please commit .hgtags manually)
+  abort: working copy of .hgtags is changed
+  (please commit .hgtags manually)
   [255]
 
   $ hg revert .hgtags