add missing header end comments

- ensures a consistent usage in header files
- also add a blank line after the copyright header where missing
- also remove orphan new-lines at the end of some files

src/rpcprotocol.h

@@ -4,7 +4,7 @@
 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
 
 #ifndef _BITCOINRPC_PROTOCOL_H_
-#define _BITCOINRPC_PROTOCOL_H_ 1
+#define _BITCOINRPC_PROTOCOL_H_
 
 #include <list>
 #include <map>
@@ -159,4 +159,4 @@ json_spirit::Object JSONRPCReplyObj(const json_spirit::Value& result, const json
 std::string JSONRPCReply(const json_spirit::Value& result, const json_spirit::Value& error, const json_spirit::Value& id);
 json_spirit::Object JSONRPCError(int code, const std::string& message);
 
-#endif
+#endif // _BITCOINRPC_PROTOCOL_H_