STRESS_TENSOR Convergence Issue

[Sebastian Hütter]

Hello Matt,

I believe I took this epsilon from one of the static energy examples, but 
it appears that I cannot find the source anymore. Hm.

New calculations with NREP 3, EPS_DEFAULT 1E-10 are running currently and 
while I now have a very asymmetric behaviour between compression and 
tension (I calculate both sides and average), results appear sane for now.

Is there a rule of thumb how many cells I will need for good results? In 
theory it's xyz-periodic anyway, but I understand in order to get fine 
enough grids I need a somewhat larger volume. In the mean time, I have also 
added CELL_REF statements with the unmodified cell to be sure there is no 
change between calculations there.


Thanks,
Sebastian
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