Elm was lgpl3, COPYING was lgpl3, docs say lgpl3. So fix everything to be v3.
Also fix the COPING for Lesser: we must include gpl (in COPYING) AND lgpl (in COPYING.LESSER).
Some stuff is not working on the C side, the unit test is full
of FIXME and TODO. The biggest problem is the PartState that
do not work at all, I will give a short look at this, but I'm
not so much intrested atm...If you want/need to help please
let me know.