[PATCH 0 of 2] Revised - Add --git option to commands which output patches

[jim.correia at gmail.com]

I've prepared a patch which adds a --git option to log, incoming, history
and tip.

The motivation for doing so is to be able to easily see the additional
things the --git diff format provides. (I had a couple of otherwise "empty"
changesets where just the +x bits changed.)

(I realize that you can force this through the --config switch, but this is
neither convenient, nor particularly discoverable, IMO.)

The first patch in the series adds the --git option.

The second patch in the series removes the short option graphlog adds to log
(-g) and takes that over as a short option for --git to be consistent with
other commands.

Implementation details:

        changeset_templater (and its superclass) takes an additional argument
        which represents the diff opts.