Introduce river mapfile generation (WARNING: Changes in config xml files required!). On startup the RiverMapfileGeneratorStarter is called by the server app. The starter invokes a call to RiverMapfileGenerator.generate() which reads all available rivers from the database and generates layers for each river (in theory...uncompleted) in a river.map file. The old MapfileGenerator which generates layers that have artifact dependencies is now in ArtifactMapfileGenerator.

package de.intevation.flys.artifacts.math;

public final class Identity
implements         Function
{
    public static final Identity IDENTITY = new Identity();

    public Identity() {
    }

    public double value(double x) {
        return x;
    }
}
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