Add RFC 6532 support to the email library

[bitdancer]

BPO	24211
Nosy	@warsaw, @bitdancer, @soltysh
Files	email_smtputf8.patch

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2015-05-17.16:17:21.632>
created_at = <Date 2015-05-16.21:19:09.918>
labels = ['type-feature', 'expert-email']
title = 'Add RFC 6532 support to the email library'
updated_at = <Date 2015-05-17.23:38:15.623>
user = 'https://github.com/bitdancer'

bugs.python.org fields:

activity = <Date 2015-05-17.23:38:15.623>
actor = 'python-dev'
assignee = 'none'
closed = True
closed_date = <Date 2015-05-17.16:17:21.632>
closer = 'r.david.murray'
components = ['email']
creation = <Date 2015-05-16.21:19:09.918>
creator = 'r.david.murray'
dependencies = []
files = ['39397']
hgrepos = []
issue_num = 24211
keywords = ['patch']
message_count = 5.0
messages = ['243368', '243403', '243408', '243412', '243432']
nosy_count = 4.0
nosy_names = ['barry', 'r.david.murray', 'python-dev', 'maciej.szulik']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'enhancement'
url = 'https://bugs.python.org/issue24211'
versions = ['Python 3.5']

[bitdancer]

I could have sworn there was an issue for this already, but I couldn't find it.

Attached patch adds a utf8 policy knob and an SMTPUTF8 policy instance, and modifies BytesGenerator and the _header_value_parser to use that policy setting to generate utf8 headers instead of encoding non-ascii using encoded words. (I designed the new code to make it easy to support this RFC, but even I had no idea the patch would be so small. I hope I didn't miss anything.)

I will probably commit this tomorrow, since the deadline is looming.

[soltysh]

David one small nit in docs, but otherwise the patch looks good, applies cleanly and works as expected.

[python-dev]

New changeset 9f0d5e33230f by R David Murray in branch 'default':
bpo-24211: Add RFC6532 support to the email library.
https://hg.python.org/cpython/rev/9f0d5e33230f

[bitdancer]

Thanks, Maciej.

[python-dev]

New changeset 4a254750ad20 by R David Murray in branch 'default':
bpo-24211: Add missing docs for SMTPUTF8 policy instance.
https://hg.python.org/cpython/rev/4a254750ad20