FeatureInfoRadius for single layer - 3.3

http://tracker.deegree.org/deegree-services/ticket/606

When a GetFeatureInfo request queries more than one layer, the layer wide radius will be applied for those layers for which the radius is set.

For the layers for which the radius is not set, the service wide radius will be applied. If the service wide radius is not set, a default value (1) will be applied.