small fix in native filters
debian: follow hardening guidelines
fix small leak in test
fix clobber warning in _mime_retrieve

during reconstruction mime recursion-depth is now limited to 64
fix all known remaining compiler warnings
fix migration filename
add missing macro
IMAP: quote address names during caching
add new multipart test message
Cleanup orphaned headername and headervalue records

Improve -t (test for message integrity) switch, seek for and remove orphaned
headername and headervalue records.
Mantis: http://www.dbmail.org/mantis/view.php?id=1008
fix counter during maintenance
allow MAX_MIME_DEPTH specification in CFLAGS
issue warnings when inserting or retrieving messages with excessive mime-depth
fix boundary scanner
IMAP: crlf encode all output
flaws found by #coverity fixed

All 'High impact' defects handled.
IMAP: cleanup and fix bodystructure
IMAP: fix BODY fetch of message/rfc822 attachments