Fix parent position in RnNames.nubAvails
- `RnNames.nubAvails', which amalgamates AvailInfo items that belong to the same parent, needs to be careful that the parent name occurs first if it is in the list of subnames at all. (Otherwise, we can get funny export items in ifaces.) - I discovered this while debugging family import/exports, but I am pretty sure the bug would also have shown up without using families under the right circumstances.
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