Minor formatting
Add start of libnumber with some Prime functions to start it off
Minor formatting change in copyright header
Remove util/Vector.h since all it provided was binary_search which duplicates std::binary_search
Add more primeDivisors tests
Make test group named Prime instead of Primes for consistency
Simplify test
Reduce excess work in isPrime test
Speed up augmented isPrime by using list as candidate divisors and starting trial division later
Enhance augmented isPrime test to properly check fallback to trial division
Reorder +2/+4 skips in prime checks to make them simpler to understand and add augmented primeDivisors