codereview: move dotfiles out of user home director to something sane.

See Rob Pike's lesson on shortcuts, https://plus.google.com/101960720994009339267/posts/R58WgWwN9jp

R=golang-dev, r, rsc
CC=aram.h, golang-dev
https://golang.org/cl/14374045

lib/codereview/codereview.py

@@ -61,6 +61,14 @@ import time
 from mercurial import commands as hg_commands
 from mercurial import util as hg_util
 
+# bind Plan 9 preferred dotfile location
+if os.sys.platform == 'plan9':
+	try:
+		import plan9
+		n = plan9.bind(os.path.expanduser("~/lib"), os.path.expanduser("~"), plan9.MBEFORE)
+	except ImportError:
+		pass
+
 defaultcc = None
 codereview_disabled = None
 real_rollback = None