Dive site: sort by distance to current dive

When presenting the list of dive sites on the dive-info tab, sort
the dive sites by distance to the current dive. The idea is that
when the user wants to select a dive site, close dive sites should
be prioritized.

The location of the dive is determined with the dive_get_gps_location()
function introduced in the previous commit. This actual GPS data get
precedence over the currently set dive site for that dive.

On change of dive, the current location is updated in the
DiveLocationFilterProxyModel so that a potentially expensive search
for GPS data is not repeated for every comparison.

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

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