make GeoGraphicsItem::latLonAltBox() purely virtual
GeoGraphicsItem::setLatLonAltBox() wasn't called anywhere, so any subclass not overriding latLonAltBox() had an empty bounding box.
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c78b2f09
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GeoGraphicsItem::setLatLonAltBox() wasn't called anywhere, so any subclass not overriding latLonAltBox() had an empty bounding box.