Implement "feefilter" P2P message.

src/protocol.cpp

@@ -34,6 +34,7 @@ const char *FILTERADD="filteradd";
 const char *FILTERCLEAR="filterclear";
 const char *REJECT="reject";
 const char *SENDHEADERS="sendheaders";
+const char *FEEFILTER="feefilter";
 };
 
 static const char* ppszTypeName[] =
@@ -68,7 +69,8 @@ const static std::string allNetMessageTypes[] = {
     NetMsgType::FILTERADD,
     NetMsgType::FILTERCLEAR,
     NetMsgType::REJECT,
-    NetMsgType::SENDHEADERS
+    NetMsgType::SENDHEADERS,
+    NetMsgType::FEEFILTER
 };
 const static std::vector<std::string> allNetMessageTypesVec(allNetMessageTypes, allNetMessageTypes+ARRAYLEN(allNetMessageTypes));