changed vtklevelset -pl option to use DiscreteFlyingEdges3D, so normals will be preserved#6

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jilei-hao wants to merge 4 commits intopyushkevich:vtk9from

jilei-hao:dev/czi-128

Commits on Mar 11, 2022

czi-112: temporarily fixed an issue causing crash
jilei-hao
committed

Commits on Jun 9, 2022

merged vtk9 branch into current
jilei-hao
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Commits on Jun 24, 2022

czi-128: use DiscreteFlyingEdges3D filter for vtklevelse -pl
jilei-hao
committed

Commits on Jul 14, 2022

czi-128: refactored the use of the filter; fixed NaN normal issue
jilei-hao
committed