fix readme; add todo note to get tests working again
reduce potential for using instances before initialization
no need for this since we will be using RSA UFOs
fix copyright notices
removed debug statements
disable fast mint -- vulnerable to timing attacks
getting there, still not right
Zerocoin block heights (mainnet todo: SET CORRECT HEIGHTS)
remove ENABLE_ZEROCOIN
singleton Zerocoin Params object from GetZerocoinParams()