[SyncEvolution] "Prevent Slow Sync" in server alerted sync

Hello, SyncEvolution now has "PreventSlowSync" on by default: As a sync initiator, if the user selects "two-way" but the engine found it has to use "SlowSync" to proceed, it is reasonable to stop the sync and warn user. However, from server alerted sync view, this has some problem: If the remote (The sync server) asks a "two-way" sync but SyncEvolution found it cannot proceed without a "slow" sync, it aborts the sync process. However from the server side view, it cannot get any information on this failure and causing confusion. I think we may disable this feature if this is a server alerted sync at client side, comments? Best Regards, Congwu