[MERGE] An EmailMessage class for bzrlib (v2)

[Martin Pool]

I tried yesterday (before Adeodato replied) to make the changes
suggested by John and I and merge, but some of the tests fail on my
machine:

# Bazaar merge directive format 1
# revision_id: rev2a
# target_branch: (.|
)*
# testament_sha1: .*
# timestamp: 1970-01-01 00:08:56 \+0001
# source_branch: (.|
)*
" not found in
"""\
Content-Type: multipart/mixed; boundary="===============0507327434=="
MIME-Version: 1.0
From: "J. Random Hacker" <jrandom at example.com>
User-Agent: Bazaar (0.18.0dev0)
To: pqm at example.com
Subject: Commit of rev2a

--===============0507327434==
Content-Type: text/plain; charset="8-bit"
MIME-Version: 1.0
Content-Transfer-Encoding: base64
Content-Disposition: inline

IyBCYXphYXIgbWVyZ2UgZGlyZWN0aXZlIGZvcm1hdCAxCiMgcmV2aXNpb25faWQ6IHJldjJhCiMg
dGFyZ2V0X2JyYW5jaDogZmlsZTovLy90bXAvdGVzdGJ6ci1yYTkweFoudG1wL3RtcGJScjFYdy93
b3JrL3RyZWVfYi8KIyB0ZXN0YW1lbnRfc2hhMTogNTE2ZDYwOTA2YzBjZTJlYjI4NDQwMDUwYTUz
NmExNGFjZjgxMzFkMAojIHRpbWVzdGFtcDogMTk3MC0wMS0wMSAwMDowODo1NiArMDAwMQojIHNv
dXJjZV9icmFuY2g6IGZpbGU6Ly8vdG1wL3Rlc3RienItcmE5MHhaLnRtcC90bXBiUnIxWHcvd29y
ay90cmVlX2EvCiMgCg==

--===============0507327434==--"""

The text is correct but it's encoded.

I'm not sure if this is an outright bug, or if it's because different
versions of the standard library have different defaults with regard
to encoding.  I have not yet looked into whether this test really
should be asserting it's unencoded (sometimes we would want that?) or
not.

Anyhow, for that reason this has slipped from 0.18.

-- 
Martin