Bring maven branch up-to-date with respect to master

Hi Evren, this pr brings the maven branch up-to-date with respect to master rev 6c88c9248f74aa16935bf509a04f96c5bff6b128. I also removed some unneeded lib folders.
In addition the mechanicalEngineeringTest is reenabled so we can investigate whether the used aterm lib
is really causing the issue with this one.