Update mercurial to 2.3

dev-vcs/mercurial/patches/mercurial-2.3.patch

@@ -0,0 +1,12 @@
+diff -up mercurial-2.3/mercurial/ui.py.orig mercurial-2.3/mercurial/ui.py
+--- mercurial-2.3/mercurial/ui.py.orig	2012-08-02 00:49:31.022544384 -0600
++++ mercurial-2.3/mercurial/ui.py	2012-08-02 01:06:19.942407680 -0600
+@@ -701,7 +701,7 @@ class ui(object):
+             # avoid confusion.
+             editor = 'E'
+         else:
+-            editor = 'vi'
++            editor = 'nano'
+         return (os.environ.get("HGEDITOR") or
+                 self.config("ui", "editor") or
+                 os.environ.get("VISUAL") or