Add wallet method for finding spendable notes in a CTransaction

src/zcash/Address.hpp

@@ -23,6 +23,7 @@ public:
         READWRITE(pk_enc);
     }
 
+    friend inline bool operator==(const PaymentAddress& a, const PaymentAddress& b) { return a.a_pk == b.a_pk && a.pk_enc == b.pk_enc; }
     friend inline bool operator<(const PaymentAddress& a, const PaymentAddress& b) { return a.a_pk < b.a_pk; }
 };
 

src/zcash/NoteEncryption.hpp

@@ -61,6 +61,8 @@ public:
     typedef boost::array<unsigned char, CLEN> Ciphertext;
     typedef boost::array<unsigned char, MLEN> Plaintext;
 
+    // Unused default constructor to make allocators happy
+    NoteDecryption() { }
     NoteDecryption(uint256 sk_enc);
 
     Plaintext decrypt(const Ciphertext &ciphertext,
@@ -68,6 +70,8 @@ public:
                       const uint256 &hSig,
                       unsigned char nonce
                      ) const;
+
+    friend inline bool operator<(const NoteDecryption& a, const NoteDecryption& b) { return a.pk_enc < b.pk_enc; }
 };
 
 uint256 random_uint256();