Deprecate implicit sync_include in Sympa::List constructor
Created by: ikedas
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review: Won't process sync_include in advance so that processing will be faster. sync_include just before message delivery will be performed as in the past.
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sync_include will no longer be invoked during Sympa::List->new():
- No owner defined in a list is no longer treated as error_config.
- Instead, if no owner defined and something has to be sent to owners,
- If possible, discard incoming message and send back DSN to original sender,
- or, notifications to owners will be redirected to listmaster(s).
This may improve speed of "review" page and so on. Also, this may fix #92 (closed) .