Allow editing of dive sites

And hook things up when double clicking the globe.

The user experience isn't consistent with what we do on the main tab
(i.e., no coloring of fields that are changed), but it seems to work.

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

qt-ui/simplewidgets.h

@@ -229,6 +229,7 @@ public slots:
 	void showEvent(QShowEvent *);
 
 	void setLocationId(uint32_t uuid);
+	void updateGpsCoordinates(void);
 
 signals:
 	void informationManagementEnded();