peer: introduce peer methods to prepare for peer classes This introduces a peer method into all repository classes, which currently simply returns self. It also changes hg.repository so it now raises an exception if the supplied paths does not resolve to a localrepo or descendant. Finally, all call sites are changed to use the peer and local methods as appropriate, where peer is used whenever the code is dealing with a remote repository (even if it's on local disk).

--- a/mercurial/repo.py	Fri Jul 06 14:12:42 2012 -0500
+++ b/mercurial/repo.py	Fri Jul 13 21:46:53 2012 +0200
@@ -33,6 +33,9 @@
     def local(self):
         return False
 
+    def peer(self):
+        return self
+
     def cancopy(self):
         return self.local()