Set up a location for Derby system directory and error file

Rather than using the current folder (by default, usually ${project.basedir}) as the system and log directory for Derby, you can set these system properties in Maven cargo configuration:

<derby.system.home>${project.basedir}/target/derby</derby.system.home>
<derby.stream.error.file>${project.basedir}/target/derby/derby.log</derby.stream.error.file>