message: add getbestblockhash to header
diff: @@ -202,6 +202,7 @@ extern json_spirit::Value getdifficulty(const json_spirit::Array& params, bool f
  extern json_spirit::Value settxfee(const json_spirit::Array& params, bool fHelp);
  extern json_spirit::Value getrawmempool(const json_spirit::Array& params, bool fHelp);
  extern json_spirit::Value getblockhash(const json_spirit::Array& params, bool fHelp);
  +extern json_spirit::Value getbestblockhash(const json_spirit::Array& params, bool fHelp);
  extern json_spirit::Value getblock(const json_spirit::Array& params, bool fHelp);
  extern json_spirit::Value gettxoutsetinfo(const json_spirit::Array& params, bool fHelp);
  extern json_spirit::Value gettxout(const json_spirit::Array& params, bool fHelp);
  