New Release Beryllium-0.4.0

With a few fixes and a few extensions, it did seem necessary to release a new version. Be warned: there is still lots of work to be done. For now, some major restructuring tasks have been undertaken: the tests have been extracted into a separate project on GitHub and the molecule library has been decommissioned. Instead, you may now build your own fairly easily. This feature is bound to be improved, however.