ZC mint relay - WIP
ZC mint transactions now pass the IsStandard() test
REVERT THIS - 15 second blocks!
non-ZC cleanup
accumulator checkpoints in block - WIP
misc. zerocoin
minor ZC commit - WIP!
WIP!!! CScript::GetCheckpoint and CoinbaseCheckpointsAreValid; the latter is unused now, but should be used for extracting checkpoints