Do not allow invariants to change on calls to XInventoryService.UpdateItem()

This is to help track down http://opensimulator.org/mantis/view.php?id=6359 where creator IDs on items and rezzed objects have been reported to sometimes change.
This should never happen - a particular item should never change creators (if an item is given then a new item (with new id) is created).
Invariants are inventory type, asset type, folder (changed only on MoveItems()), CreatorIdentification and Owner.
If caller attempts to change an invariant, warning is logged but other properties are still changed.
If you see this warning, reporting on Mantis 6359 would be very welcome with the exact operation being done at the time.

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