Release based on commit 9a4d04c05fbaad6e6de750b13cfeab9edeb71c90 from Oct 10, 2020.
Unfortunately, all previous releases of eigen4rkt did not work well with Optima. Recent versions of Eigen are causing segfaults. That's why we are using a slightly older commit. This should be revisited in the future (test with newer versions of Eigen).