Merge pull request #3854 from RosettaCommons/JackMaguire/UnorderedSets
Sergey gave us advice at Winter RosettaCON to decrease the max_load_factor of our unordered_sets and unordered_maps from the default value of 1 to 0.7-ish to make lookups faster. We don't have many unordered containers in Rosetta but I found a handful that could benefit from this change.