Rename _are_rebasing to _isrebasing.

 
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            @@ -197,7 +197,7 @@
 
             wlock = repo.wlock()
             try:
-                if getattr(repo, "_are_rebasing", False):
+                if getattr(repo, "_isrebasing", False):
                     # We have to take the time to pull down the new bfiles now.  Otherwise
                     # if we are rebasing, any bfiles that were modified in the changesets we 
                     # are rebasing on top of get overwritten either by the rebase or in the
@@ -867,7 +867,7 @@
 # in the working copy
 def override_pull(orig, ui, repo, source="default", **opts):
     if opts.get('rebase', False):
-        repo._are_rebasing = True
+        repo._isrebasing = True
         try:
             if opts.get('update'):
                  del opts['update']
@@ -895,17 +895,17 @@
                 branch = repo[None].branch()
             dest = repo[branch].rev()
         finally:
-            repo._are_rebasing = False
+            repo._isrebasing = False
     else:
         result = orig(ui, repo, source, **opts)
     return result
 
 def override_rebase(orig, ui, repo, **opts):
-    repo._are_rebasing = True
+    repo._isrebasing = True
     try:
         orig(ui, repo, **opts)
     finally:
-        repo._are_rebasing = False
+        repo._isrebasing = False
 
 def override_archive(orig, repo, dest, node, kind, decode=True, matchfn=None,
             prefix=None, mtime=None, subrepos=None):