Update comments.

src/dwgpsnmea.c

@@ -289,6 +289,7 @@ static void * read_gpsnmea_thread (void *arg)
 	      }
 
 /* Process sentence. */
+// FIXME: Ignore the second letter rather than recognizing only GP... and GN...
 
 	      if (strncmp(gps_msg, "$GPRMC", 6) == 0 ||
 		  strncmp(gps_msg, "$GNRMC", 6) == 0) {

src/server.c

@@ -116,6 +116,10 @@
  * References:	AGWPE TCP/IP API Tutorial
  *		http://uz7ho.org.ua/includes/agwpeapi.htm
  *
+ *		It has disappeared from the original location but you can find it here:
+ *		https://web.archive.org/web/20130807113413/http:/uz7ho.org.ua/includes/agwpeapi.htm
+ *		https://www.on7lds.net/42/sites/default/files/AGWPEAPI.HTM
+ *
  * 		Getting Started with Winsock
  *		http://msdn.microsoft.com/en-us/library/windows/desktop/bb530742(v=vs.85).aspx
  *