Berthold Stoeger b6bf57a13b Introduce negate-toggle buttons to filter lists
Introduce toggle buttons which mean "filter all dives except
those fulfilling the selected criteria".

The old code used to check for rowCount() == 0. This should never happen,
because there is always a row "empty field". This check was moved into
the preamble of the functions to seperate it from the actual logic.

Fixes #435

Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
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