Reformatted text
Revert "oblige the application to explicitely set the node type for PLAIN"

This reverts commit 1206f4572b4b3bb405a14cc60605b75d53b819a0.
Revert "makes curve keys symetric as in libcurve + factorisation"

This reverts commit bfd472f97cad5e37fa384b687a906f515600bac4.
Merge pull request #667 from hintjens/master

Reverted pull request 666