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

[Xavier Maillard]

   [...]

   The tab characters are in this part of mail_client.py:

   [...]

   Specifically, the (cond ...) lines.

   The rest of the diff looked clean to me.

Thank you. With your help and Matthieu's help, I fixed my patch.
It seems it was okay since it has been merged.

Regards,

	Xavier
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