Added `--no-igd` as an alias for `--no-upnp`

For compatibility with monerod command line parameters

docs/COMMAND_LINE.MD

@@ -27,6 +27,7 @@
 --no-dns             Disable DNS queries, use only IP addresses to connect to peers (seed node DNS will be unavailable too)
 --p2p-external-port  Port number that your router uses for mapping to your local p2p port. Use it if you are behind a NAT and still want to accept incoming connections
 --no-upnp            Disable UPnP port forwarding
+--no-igd             An alias for --no-upnp
 --upnp-stratum       Port forward Stratum port (it's not forwarded by default)
 ```
 

src/main.cpp

@@ -55,6 +55,7 @@ void p2pool_usage()
 		"--p2p-external-port  Port number that your router uses for mapping to your local p2p port. Use it if you are behind a NAT and still want to accept incoming connections\n"
 #ifdef WITH_UPNP
 		"--no-upnp            Disable UPnP port forwarding\n"
+		"--no-igd             An alias for --no-upnp\n"
 		"--upnp-stratum       Port forward Stratum port (it's not forwarded by default)\n"
 #endif
 		"--help               Show this help message\n\n"

src/params.cpp

@@ -154,7 +154,7 @@ Params::Params(int argc, char* argv[])
 		}
 
 #ifdef WITH_UPNP
-		if (strcmp(argv[i], "--no-upnp") == 0) {
+		if ((strcmp(argv[i], "--no-upnp") == 0) || (strcmp(argv[i], "--no-igd") == 0)) {
 			m_upnp = false;
 			ok = true;
 		}