New wallet system. Still missing unit tests, ledger synchronization,

and SQL code. This uses some of the 'magic' properties of elliptic
curves to create related families of public and private keys.
Wallet encryption is not needed because the private keys do not
need to be stored.

NewcoinAddress.cpp

@@ -4,7 +4,6 @@
 #include <assert.h>
 
 
-
 bool NewcoinAddress::SetHash160(const uint160& hash160)
 {
 	SetData(51, &hash160, 20);
@@ -25,7 +24,7 @@ NewcoinAddress::NewcoinAddress()
 {
 }
 
-NewcoinAddress::NewcoinAddress(uint160& hash160In)
+NewcoinAddress::NewcoinAddress(const uint160& hash160In)
 {
 	SetHash160(hash160In);
 }
@@ -53,3 +52,7 @@ uint160 NewcoinAddress::GetHash160()  const
 	return hash160;
 }
 
+std::string NewcoinAddress::GetString() const
+{
+	return ToString();
+}