tag: warn users about tag/branch possible name conflicts As reported recently, Mercurial users can easily find confusion when using a common name for a tag and a branch. It seems reasonable to warn them about this potential outcome, to avoid that "surprise". * Explain briefly the issue in "hg help tag" * Warn when tagging a revision

--- a/tests/test-tag	Mon Apr 19 11:31:19 2010 +0200
+++ b/tests/test-tag	Mon Apr 19 17:41:12 2010 +0900
@@ -68,3 +68,8 @@
 cat .hgtags
 hg tag -d '1000000 0' newline
 cat .hgtags
+
+echo % tag and branch using same name
+hg branch tag-and-branch-same-name
+hg ci -m"discouraged"
+hg tag tag-and-branch-same-name