Implement the context menu a different way

It seems that this is the way this is supposed to be done - instead of
manually looking at what kind of click we get, Qt decides when to create
a context menu for us - this way things like the Windows Menu button
will work automagically.

As an example I also implemented the "remove dive from trip"
functionality, which exposes some other bugs (like the fact that the
dive that isn't part of a trip ends up being sorted at the very end of
the dive list).

This commit contains a "testSlot" implementation to remind me how to
figure out which dive / trip we are on.

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

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