[MERGE] Replace mail-mode call with compose-mail from GNU Emacs.

[Xavier Maillard]

   > Thank you all for the helpful reviews.

   No problem. It's great to see these sort of patches being sent in. The
   Bazaar community has a high emphasis on making developers productive.
   Tighter integration between Emacs and Bazaar can only help that. If you
   have more ideas on improving the integration, I hope you decide to work
   on them.

I have already begun to add a few other things. But once again,
as I am not skilled in python at all, it is pretty hard and it
takes very long to write anything for me :)

Stay tuned.

	Xavier
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