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" ?>
<datacage>
    <user>SA</user>
    <password/>
    <driver>org.h2.Driver</driver>
    <url>jdbc:h2:${artifacts.config.dir}/../datacagedb/datacage</url>
</datacage>