Add `BigUint::{is, next}_power_of_two()`#212

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PatrickNorton wants to merge 2 commits intorust-num:masterfrom PatrickNorton:power-two

+38

Commits on Aug 8, 2021

Added BigUint::{is, next}_power_of_two()
PatrickNorton
committed

Commits on Aug 28, 2021

Added BigUint::to_next_power_of_two
PatrickNorton
committed