Fix AxisClip, AxisCut and AxisReflection on HTG and UniformHyperTreeGrid

Jacques-Bernard Lekienrequested to merge
fix-htg-axis-clip into master

Fix made by significantly increasing test coverage of AxisClip, AxisCut and AxisReflection on HyperTreeGird and UniformHyperTreeGrid in 3D as well as following the three orientations in 2D (XY, YZ, XZ)).

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