Add default GPS location for dive sites we already know about

[Linus Torvalds]

When editing a new dive, and using a dive site name that we have
already seen previously, and have GPS information for, pick up that
GPS information from the previous dive by default.

NOTE! When editing dive site locations for dives that already have GPS
information, or when we've modified the GPS information explicitly
some way while editing the dive (either through map input or by
editing the text field directly) we do *not* use this automatic logic.

So if you messed up the GPS information some way and want to
re-populate it with the automatic mode, you need to explicitly clear
the GPS text-field, at which point we go back to "ok, let's try to
pick up automatic GPS data from previous dives with the same name"
mode.

Also note that we do the automatic location lookup only when actually
editing the location field. So if you already wrote the dive site
name, then cleared the GPS field, you now need to go back to the dive
site name and edit it again to get the automatic GPS filling.

Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
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