Introduce HTG unlimited cursor and tests
Unlimited cursors can go deeper than a leaf nodes, allowing to simulated an infinite subdivision. The respect the DepthLimiter, but not yet the mask.
Testing has been added.
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Test that the neighborhood is also unlimited in the Moore cursors (may not be)
The first commit is a copy paste due to HTG mechanism. Please, review the second one only: !9505 (386e9ddc)
Edited by Charles Gueunet