Use the existing current_dive macro in Qt code

Replicating this with the currentDive member seems to make no sense.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Add data and add functions for WeightModel

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Hook up adding a weightsystem

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Don't add cylinders and weightsystems past the MAX

We actually should disable the 'Add' button, I guess.

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>