iang/arctic: Library and benchmark program for Arctic and Shine @ a75bd1e0ed9c4d7d74b2ff15d289bc0c4548c4d8

Library and benchmark program for Arctic and Shine

Ian Goldberg a75bd1e0ed Use references, not copies, in the inner loop of gen		vor 3 Monaten
src	a75bd1e0ed Use references, not copies, in the inner loop of gen	vor 3 Monaten
Cargo.toml	6029009659 Use itertools::combinations instead of rolling our own	vor 3 Monaten