Create DiveSummary class in backend-shared and make the DiveSummary calculation
results available to QML.
This adds a loop over all dives (could have been done with a model, but the
models available to mobile are very limited, so use the basic way).
[Dirk Hohndel: renamed the results variable and combined a couple of commits]
Signed-off-by: jan Iversen <jan@casacondor.com>
Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
