Have vtk comparison accept generic zero threshold
Right now, the zero threshold must be set for each component individually. It would be nice to be able to set a default for all compontents, such as:
[wrapper.vtkcompare]
name = ...
reference = ...
extension = vtu
zeroThreshold = 1e-6
instead of
[wrapper.vtkcompare]
name = ...
reference = ...
extension = vtu
zeroThreshold.data_0 = 1e-6
zeroThreshold.data_1 = 1e-6