[sup-devel] Ruby 1.9 encoding fixes

[Rich Lane <rlane@club.cc.cmu.edu>]

This patchset fixes the string encoding issues on Ruby 1.9.1. The general
strategy is to treat raw messsages as binary and ensure that everything is
passed through Iconv or String#ascii before being displayed or stored. I tested
an earlier version of this patchset (with more debug checks) on around 700
thousand mails including plenty of spam. It'd be nice if someone tested
signed/encrypted mails to make sure I didn't break anything there.

The only effect on Ruby 1.8 should be asciifying the raw header/message view,
and maybe a little speedup due to reusing the RMail message header instead of
parsing it ourselves.

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