undo: refine pasting of cylinders

When pasting cylinders, the destination dive got a verbatim copy
of the cylinders of the source dive. This is not what users want:
for example, the start and stop pressures from the dive computer
as well as the gas mix may be overwritten.

There seems to be no perfect solution, since some times users may
want to paste the gas-mix.

Therefore, let's choose a heuristic approach for now (in the future
we might implement a UI-flag):

When copying over existing cylinders, only copy type and maximum
pressure.

When adding new cylinders (i.e. from-dive has more cylinders than
to-dive), copy everything, but reset start- and top-pressure to 0,
which represents unkown.

Moroever, in the latter case, set "manually added" to true, since
obviously this wasn't added by a dive computer.

Fixes #2676

Reported-by: Miika Turkia <miika.turkia@gmail.com>
Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>

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