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.

<?xml version="1.0" encoding="UTF-8" ?>
<seddb-database>
    <!-- This is the default SedDB db configuration. -->
    <user>sedb</user>
    <password>sedb</password>
    <dialect>org.hibernate.dialect.PostgreSQLDialect</dialect>
    <driver>org.postgresql.Driver</driver>
    <url>jdbc:postgresql://localhost:5432/seddb</url>
</seddb-database>