LibXC GGA & MetaGGA in the vaccuum
LibXC should also support the vaccum for GGAs and MetaGGAs
Why is this feature needed?
It seems most FLEUR users are doing somekind of Film calculations.
I am not sure how much effort we should invest. The easiest would be to say that the vaccuum only has a small contribution to the total energy and that we therefore can do LDA/GGA in the vacuum, but this seems very hacky.
Any opinions on this?