- tested for bias-exchange
- now new force-flags in gromacs so HREX should work equally to 2018
- ENERGY collective varialbe should be tested..

@chi2, @chi3, @chi4 and @chi5

This add some incompatibility with all former implementations but is far easier to use

and SCEXP to SCALEINT

todo:
- gpu should only be run by master
- add documentation