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.

For the artifact database
# su - postgres
$ createuser --no-createrole --no-superuser --pwprompt --no-createdb artifacts
$ createdb --encoding=UTF-8 --owner artifacts artifactsdb

For the flys database

# su - postgres
$ createuser --no-createrole --no-superuser --pwprompt --no-createdb flys
$ createdb --encoding=UTF-8 --owner flys flystest1