6a6b992a77
The undo system sets updates individual dive fields on redo respectively undo. Make salinity such a field, since it is changed on replanning a dive. To do this, break out the "update salinity" functionality into its own function, add an entry to the DiveField enum and add the corresponding switch-case. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>