formating
New envelope upgrade strategy: do the upgrade on the dictionnary
itself which makes incremental upgrade simpler.
- sort the field names where appropriate.
- add missing smtpname in v2 envelopes in the dict if necessary.
Old v1 envelopes may have a msgid field.  If so, remove it in the dict
upgrade.  Get rid the noop "msgid" case from in the loader.
time_t is 64 bits now
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Merge branch 'master' of ssh.poolp.org:/git/opensmtpd
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