Required software:
- lucene-core (comes in pom.xml)
- jargs (somehow not in a Maven repository, sad):
    Install it into the local Maven repository:
    mvn install:install-file -Dfile=sw/jargs-1.0.0.jar -DgroupId=jargs -DartifactId=jargs -Dversion=1.0.0 -Dpackaging=jar