fix typo; rebranding
Merge remote-tracking branch 'origin/master-neo' into zerocoin
Merge Zerocoin bignum.h changes into Anoncoin bignum.h. Note that the
CBigNum % CBigNum operator now uses BN_nnmod instead of BN_mod, which only
makes a difference when applied to negative numbers. There do not appear to be
any occurrences of CBigNum % CBigNum in Anoncoin, so this should not be a
problem.
Latest commit in "dev" branch of libzerocoin repo