reject headers that start with a space or tab

If the first header starts with a space but still contains a colon
character, it is added to the body mail effectively appending it to the
Received head

reject headers that start with a space or tab

If the first header starts with a space but still contains a colon
character, it is added to the body mail effectively appending it to the
Received header due to the folding rules.

Issue reported by Crystal Kolipe

ok millert@, giovanni@

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add required headers for smtpd.h and remove unnecessary ones in other files.

ok jung@

replace EFTYPE with EINVAL which is a both a better errno AND more portable

ok eric@

import alternative message parser (not used yet).