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RRset merge operation is too slow for big RRsets

Query cmts1-dhcp.longlines.com. A takes more than 10 seconds, probably because some \mathcal{O}(n^2) complexity in kr_ranked_rrarray_add() or something like that.

Such query can be used to DoS resolver so we have to fix that.

Edited by Štěpán Balážik
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