Place uniques before connectivity checks.

Placing them after connectivity checks causes issues when (larger)
vaults split the level or clobber staircases. This, in combination with
setting it to non-clobber, should solve all of these issues.

It may mean that some uniques are placed less than others (such as
Yiuf's vault), and thus may require that his vault has its weight
increased slightly to compensate.

However, it also means that it's now safe to create other, similar
vaults.

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