Rework ATWriter/Exporter - Make the write function static as both data and gauge information is necessary for writing. - Use the rivers WST unit for the gauge datum - Handle the case that we are at a gauge - Differentiate between calculated values - Always work with w in CM and thus avoid double number format problems

<?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>