Normalized whitespace in be-handle-mail and send_pgp_mime.py.

Also removed "commit after every message" from be-handle-mail,
because
  a) not implemented yet
  b) don't want to commit spam, since we'd have to find a way to
  remove it later.

Suggested future workflow:
  * "bzr diff" to poll for activity, blank output = no activity.
  * on activity:
    1) look at changes
    2) remove whatever
    3) commit email-interface repo.
    4) merge changes into your private repo
  * on private repo changes:
    * if activity in email-interface repo:
      1) deal with email activity as above
    * push your private repo onto the email-interface repo
      (and update the email repos' working tree, if required)

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