push: obsolete rather than rebase & strip when enabled This requires a few changes to wrappers.push() to use obsolescence rather than strip and to make the rebase -- which is non-destructive with obsolete active -- to no longer keep the originals. Possible future work involves no longer relying on rebase for non-outgoing revisions, and simply leaving them in the troubled state. We test this feature by adding setting obsolete_mode_tests to True in classes that push changes.

--- a/tests/test_single_dir_push.py
+++ b/tests/test_single_dir_push.py
@@ -11,6 +11,8 @@ from mercurial import node
 from mercurial import ui
 
 class TestSingleDirPush(test_util.TestBase):
+    obsolete_mode_tests = True
+
     def test_push_single_dir(self):
         # Tests simple pushing from default branch to a single dir repo
         repo, repo_path = self.load_and_fetch('branch_from_tag.svndump',