Enable changeset obsoletion in mercurial

Issue #684
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/vcs.py

@@ -898,6 +898,7 @@ class HgRepository(Repository):
         # We also enable some necessary extensions here
         self.set_config('extensions.strip', '')
         self.set_config('extensions.rebase', '')
+        self.set_config('experimental.evolveopts', 'all')
 
     def configure_branch(self, branch):
         """