allow coins of indeterminate denomination, to be specified later
prevent problem where the template is used rather than my new constructor; I'm not enough of a C++ wizard to fix it the right way :P
zerocoin version bump
smart pointer for PrivateCoin (TODO: PublicCoin)
RPC getnewzerocoins (WIP! still need to store the PrivateCoins!!!)
CZerocoinStore WIP