Gromox 1.6

Fixes:

• delivery-queue: fix three crashes involving stream processing
• exmdb_local: stop emitting bogus message length into temporary message files
• exmdb_local: fix crash on read-back of temporary message files
• mda: add a delivery mechanism for Out Of Office autoreplies
• mt2exm: fix an inverted condition that would erroneously raise error code PG-1122

Enhancements:

• mt2exm: add an -x option for ignoring duplicated folder creations
• kdb2mt: the special folder for junk e-mail is now recognized (relevant for when the -s command-line option is used).

Changes:

• delivery-queue: the flusher plugin mechanism has been dropped; the only plugin there was, libgxf_message_enqueue, is now directly in the program.
• Scope-based resource management for a number of internal library classes.