Word difference extension for Mercurial

Enable this extension with::

  wdiff = ~/path/to/

and enjoy word diffs in the output of ``hg diff`` and ``hg serve``.

.. warning::

   There is a major incompatibility between this extension and the MQ
   extension. Specifically, changesets that are turned into MQ patches
   (with ``hg qimport -r``) will contain the ANSI color codes.

This extension is quite experimental, and any help or suggestions for
making it better will be gladly accepted. Please discuss them on the
`Mercurial development list`_. If we can find a good feature set, I
hope we can include this extension with Mercurial 1.4.

.. _Mercurial development list: