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Use unordered multimap instead of boost flat multimap.

Goetz Gaycken requested to merge goetz/athena:main_replace_flatmap_with_unordered_map into main

In vtune profiles a significant fraction of the cpu is spend in addSeeds on inserting elements into the boost flat_multimap. The time spend in addSeeds can be reduced significantly by using a std unordered map instead, which trades cpu for larger memory consumption.

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