mapwidgethelper: add the reloadMapLocations() method

reloadMapLocations() is the method which is called when the list
of markers (model) should be cleared and re-populated with new MapLocation
objects.

Signed-off-by: Lubomir I. Ivanov <neolit123@gmail.com>

mobile-widgets/qmlmapwidgethelper.h

@@ -17,6 +17,7 @@ public:
 	explicit MapWidgetHelper(QObject *parent = NULL);
 
 	void centerOnDiveSite(struct dive_site *);
+	void reloadMapLocations();
 
 private:
 	QObject *m_map;