Hole anchoring mode.
It specifies the way the hole is anchored to its support.
This is valid with catCounterboredHole and
catCounterdrilledHole holes only.
Otherwise, holes are considered as anchored with the top of their head.
Values:
catExtremPointHoleAnchor
The hole is anchored with the top of its head
dd>
catCATMiddlePointHoleAnchor
The hole is anchored with the bottom of its head
dd>