Pushed up a threshold in init/brzone2.f90
The threshold was used at several places to decide whether two values are identical, on which side of a plane a point lies, and so on. The strict value before lead to problems as some points were not considered to be identical due to numerical reasons, although they were meant to be identical. The larger threshold now solves the problems. However, if more problems like this arise it should be checked whether the threshold has to have different values at different places in the code. Also additional code may be required to treat certain cases in a special way.
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