#12 Options to define master & slave when differences need sync

[WimBos]

Define how to handle differences between local & server:

An option should be added to define if the local client is a slave (do not update server, but make local a copy of server), master (local is always richt and only make updates on server) or ask (present overview of modifications to do and allow user to change direction of updating).

[Anonymous]

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The same like #1964327
Please add this feature soon (it's already implemented in the windows version)