Fix so In-Reply-To header is set also for MDN receipts (#1490523)

Aleksander Machniak

2015-09-06 91018f38d4d50ecaf2576e817f5bd8442c5341e9

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-- Updates from version 0.7-beta
 
ALTER TABLE `session` CHANGE `sess_id` `sess_id` varchar(128) NOT NULL;