COT shouldn't clone existing items to lower InstanceID

[glennmatthews]

Because COT always picks the lowest unused InstanceID when creating an Item, when given an OVF with non-consecutive InstanceIDs (e.g., 1, 2, 3, 4, 10, 11, 12, 2001, 2002) then cloning existing Items will result in them being out-of-order (e.g., cloning Item 2002 will result in a new Item with InstanceID 5), which can subsequently cause problems because COT iterates over items in InstanceID order (so the newly cloned Item comes before the item it was cloned from, rather than after as COT expects).

Probably COT should always clone to an InstanceID higher than the item being cloned.