Simple simplifications on the DiveObjectHandler

[Tomaz Canabrava]

Some simplifications that I realized where simple to do and didn't
introduced any regressions.

I'm also thinking of using this class instead of struct dive* directly on
the C++ side, but it's not ready for that yet.

It's ready to substitute the struct dive* on the DiveTripModel, and when I
do that we will kill the DiveListModel since they are redundant.

Tomaz
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