Improve handling of cylinders with identical gasmix

In reality we have no concept for handling those, yet. But the UI doesn't
prevent the user from entering multiple cylinders with the same gasmix, so
we need to help the user to get rid of them as well.

If the user attempts to remove a cylinder we check if there's a second
cylinder with the same gas. If that's the case then we can proceed and
remove the cylinder the user wants to get rid of without losing that gas
for the dive. The only tricky issue is that we need to make sure that if
we remove the first cylinder that one is actually replaced with one with
the same gas.

Fixes #622

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

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