RippleAddress:  Don't copy-construct CKeys
CKey:  Prevent copying a CKey
RippleAddress:  Cull unused humanAddressType()
RippleAddress:  Make Hash160() static
ec_key:  Add very thin EC_KEY wrapper class
ECDSA:  Add ECDSASign()
ec_key
EDCSA
RippleAddress:  Use ECDSASign()
CKey:  Remove Sign()
CKeyECIES:  Cull unused (and undeclared) checkECIES()
CKey:  Cull now unused MakeNewKey()
CKey:  getECIESSecret() invocant must be the private key
CKey:  Make getECIESSecret() a static function
CKey:  Make {en,de}cryptECIES() static functions
ec_key:  Add public key constructor
RippleAddress:  Use ec_key in accountPrivateDecrypt()
RippleAddress:  Use ec_key in accountPrivateEncrypt()
fixup RippleAddress::accountPrivateSign()
CKey:  Cull unused SetPrivateKeyU() and uint256 ctor