Berthold Stoeger 89e0c3f464 Cleanup: make DiveTripModel a global object
DiveTripModel (the model describing the dive-list) was destroyed
and recreated on every reset of the list. This seems excessive.
Instead - in analogy to most other models - make it a single
global object.

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
2018-09-01 07:48:43 -07:00
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