A few style fixes based on commit reviews.

Switchboard.py
    - Use listname.encode('utf-8') to produce the necessary 8-bit string,
      instead of str(listname).  Also update the preceding comment.

senddigests.py
    - Remove an unnecessary import.

Decorate.py
    - Remove a commented out section of code.
    - Remove some redundant local variables
    - Reorganize the section that's trying to find a usable encoding for the
      payload of the modified message.  I don't think it really hurts much to
      try duplicate charsets when lcset == mcset, or when either == utf-8.
      Just go ahead and try them and let them fail.  This simplifies the code.

      Also, try to get just the minimum necessary code under the
      UnicodeError.  I think it's enough to catch the payload.encode() call.

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