Fix logging setup _ Silence message about missing SLF4J implementation _ Route java.util.logging to Log4J (at least restlet is affected) _ Let messages of additional loggers pass to the root loggers appender (otherwise, they don't appear at all)

<?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>