all: unify big.Int zero checks, use common/math in more places#3716

Merged

obscuren merged 3 commits intoethereum:masterfrom fjl:math-opt

Feb 28, 2017

+104-114

Commits on Feb 26, 2017

common/math: optimize PaddedBigBytes, use it more
fjl
committed

Commits on Feb 27, 2017