Added Mercurial version comments.

 
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            @@ -153,8 +153,10 @@
     '''
     admin = repo.join(long_name)
     try:
+        # Mercurial >= 1.9
         opener = scmutil.opener(admin)
     except ImportError:
+        # Mercurial <= 1.8
         opener = util.opener(admin)
     if hasattr(repo.dirstate, '_validate'):
         bfdirstate = dirstate.dirstate(opener, ui, repo.root, repo.dirstate._validate)
@@ -273,8 +275,10 @@
     the match object\'s bad() method so it does not print any warnings
     about missing files or directories.'''
     try:
+        # Mercurial >= 1.9
         match = scmutil.match(repo[None], pats, opts)
     except ImportError:
+        # Mercurial <= 1.8
         match = cmdutil.match(repo, pats, opts)
         
     if not showbad: