add min number of Pointer items
X+*min is the smallest number N of items allowed to be selected when editing any Pointer ending with X.
For list input:
- start with *min number of blank items showing
- no red Xs whenever the *min number of items are showing
How "hard" does this push for the minimum? Checkboxes and multiselects could start with the first N items selected? What if for list input someone Creates/Saves with nothing in one or more of the *min items? Do we need to design a validation process asking people to fill in the minimum number of items?