Add a module service. It's now possible to configure the modules which are available for a client. With the selected attribute it is possible to give a hint for the client which module should be pre selected by default flys-artifacts/trunk@5330 c6561f87-3c4e-4783-a992-168aeb5c3f6f

<?xml version="1.0" encoding="UTF-8" ?>
<rest-server>
    <!--  The port which the ArtifactDatabase (ArtifactServer) will bind to. -->
    <port>8181</port>
    <listen>localhost</listen>
</rest-server>