The edit-commands were called with a list of selected dives and
the original value. Move the creation of the list and extraction
of the original value into the edit-commmands.
This removes the "current is last" rule and allows for more
flexibility.
Since the depth- and duration editing applies only to the current
dive and not all selected dives, add a parameter to the edit-commands
controlling whether only the current or all selected dives are edited.
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
5436f9b859