Move README.Emacs to the devguide.

Misc/README.Emacs

-=============
-Emacs support
-=============
-
-If you want to edit Python code in Emacs, you should download python-mode.el
-and install it somewhere on your load-path.  See the project page to download:
-
-    https://launchpad.net/python-mode
-
-While Emacs comes with a python.el file, it is not recommended.
-python-mode.el is maintained by core Python developers and is generally
-considered more Python programmer friendly.  For example, python-mode.el
-includes a killer feature called `pdbtrack` which allows you to set a pdb
-breakpoint in your code, run your program in an Emacs shell buffer, and do gud
-style debugging when the breakpoint is hit.
-
-python-mode.el is compatible with both GNU Emacs from the FSF, and XEmacs.
-
-For more information and bug reporting, see the above project page.  For help,
-development, or discussions, see the python-mode mailing list:
-
-    http://mail.python.org/mailman/listinfo/python-mode
-
-
-..
-   Local Variables:
-   mode: indented-text
-   indent-tabs-mode: nil
-   sentence-end-double-space: t
-   fill-column: 78
-   coding: utf-8
-   End: