Minor fixes

[totork]

1. The change regarding psi in GEQDSK is needed to create TCV X-21 grids. Otherwise I do get an error because of different dimensions
2. Using Byfunc can yield negative fields and thus negative cell Areas. Magnetic flux conservation should also use the total magnetic field and not just the toroidal component I think.
3. Run add_dagp() by default. Otherwise Hermes-3 will throw an error anyway.

[dschwoerer]

1. The change regarding psi in GEQDSK is needed to create TCV X-21 grids. Otherwise I do get an error because of different dimensions

Ok, it would be nice to have a test for this.
Also remove the broken code, rather then comment it out

2. Using Byfunc can yield negative fields and thus negative cell Areas. Magnetic flux conservation should also use the total magnetic field and not just the toroidal component I think.

We disagree on this.

3. Run add_dagp() by default. Otherwise Hermes-3 will throw an error anyway.

I think this is uncontroversial and could be merged, if it would be a separate PR.

Could you force push, rather then add an extra revert commit?