message: wallet: add input weights to CCoinControl
  In order to allow coin selection to take weights from the user,
  CCoinControl needs to be able to set and get them.
diff: @@ -105,9 +105,28 @@ public:
  vOutpoints.assign(setSelected.begin(), setSelected.end());
  }
  + void SetInputWeight(const COutPoint& outpoint, int64_t weight)
  + {
  + m_input_weights[outpoint] = weight;
  + }
  +
  + bool HasInputWeight(const COutPoint& outpoint) const
  + {
  + return m_input_weights.count(outpoint) > 0;
  + }
  +
  + int64_t GetInputWeight(const COutPoint& outpoint) const
  + {
  + auto it = m_input_weights.find(outpoint);
  + assert(it != m_input_weights.end());
  + return it->second;
  + }
  +
  private:
  std::set<COutPoint> setSelected;
  std::map<COutPoint, CTxOut> m_external_txouts;
  + //! Map of COutPoints to the maximum weight for that input
  + std::map<COutPoint, int64_t> m_input_weights;
  };
  } // namespace wallet
  