#6 tags mangled by quoted printable

[Stuart D. Gathman]

Just noticed that a lot of tags from one user are
getting ignored because they have '=<NL>' inserted. It
seems that some software is requoting text/html
attachments. I should talk, pydspam requotes
attachments that are base64 as quoted printable so that
I can do a direct search for tags without parsing. But
now something is requoting the quoted printable. The
first thing to do is get a test case.

[Stuart D. Gathman]

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I suspect that Dspam._tag_part might be doing this when
recoding, but I couldn't construct a test case. I made
extract tags remove qp line breaks to work around the
problem in most cases.

I notice that there are multiple tags when the problem occurs.

[Stuart D. Gathman]

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Noticing lots of 'no tags' errors at dspam clients.
Something about tag handling is broken with pydspam-1.1.8.
Will have pydspam save message for inspection on no tags
error. Hope that helps to spot the problem.