FeedParser does not comply with RFC2822

[quantumfyre]

BPO	1347874
Nosy	@warsaw

^{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 = 'https://github.com/warsaw'
closed_at = <Date 2006-01-17.06:00:10.000>
created_at = <Date 2005-11-04.02:58:48.000>
labels = ['library']
title = 'FeedParser does not comply with RFC2822'
updated_at = <Date 2006-01-17.06:00:10.000>
user = 'https://bugs.python.org/quantumfyre'

bugs.python.org fields:

activity = <Date 2006-01-17.06:00:10.000>
actor = 'barry'
assignee = 'barry'
closed = True
closed_date = None
closer = None
components = ['Library (Lib)']
creation = <Date 2005-11-04.02:58:48.000>
creator = 'quantumfyre'
dependencies = []
files = []
hgrepos = []
issue_num = 1347874
keywords = []
message_count = 2.0
messages = ['26796', '26797']
nosy_count = 2.0
nosy_names = ['barry', 'quantumfyre']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue1347874'
versions = ['Python 2.4']

[quantumfyre]

FeedParser (from Lib/email/FeedParser.py) uses
the regular expression:

^(From |[\041-\071\073-\176]{2,}:|[\t ])

to recognise Mail headers. However RFC2822
says:

field-name := 1*ftext

which would give the regular expression:

^(From |[\041-\071\073-\176]{1,}:|[\t ])

This causes mails that use single character
header field names to be parsed incorrectly.

[warsaw]

Logged In: YES
user_id=12800

Fixed as suggested.

r42083 in the trunk (Python 2.5)
r42084 in the release24-maint branch (Python 2.4)