Options by zoom strategy with hover control example (bdga data)

The current example demonstrate a single Vector layer using multiple data sources changing the featureType option of the protocol (WFS-T here) and format (GML here) so that each zoom level loads with different data.

Also shows the use of the HighlightFeature Control. When the mouse become hover a feature, the control change its color without selecting it. At the same time, a popup is of the feature's attributes is displayed.