@JeroenMulkers Travis fails, could you please rebase against master and double check it compiles?

Rebuild the kernels. Should be OK now.

Travis succeeds

@JeroenMulkers Are there any tests of openbc in particular?

@JeroenMulkers can we benefit from these tests https://github.com/fangohr/paper-supplement-standard-problem-dmi/tree/master/sims ?

I added a test for the open BC based on the '1D' standard problem proposed by Cortés-Ortuño et al. See test/openbc.mx3 for more details.

@JeroenMulkers I am more comfortable with 1e-5 tolerance. Can you achieve it with smaller cells? Then, would you be so kind to make three identical tests, but aligned along x, y and z?

I could bring the tolerance down to 1e-3. The analytical result gives the canting at the edge of an infinitely long wire, whereas we of course simulate a finite wire. Therefore, it is hard to let the simulated canting converge to the analytical one.

It is easy to shown that a 1D model can be simulated by using one row of cells (let's say in the x direction) and periodic boundary conditions in the y direction. Hence, we can also compare the case with open and periodic boundary conditions. In this case, a tolerance of 1e-5 can be achieved.

I have added the case where the nano wire is aligned along the y direction. There is no canting at the edges of a nano wire along the z direction, so this case is not tested.