(svn r8631) -Add: added parameter -l ip[:port] to ./openttd, which redirects DEBUG() to a remote connection over TCP

For example, launch on 192.168.0.1 with, say, netcat a listener: netcat -l -p 3982
  Launch OpenTTD on a remote host (say, PSP): ./openttd -l 192.168.0.1 -d9
  And you get all debug information on 192.168.0.1. Very useful for debugging Portable systems.

src/network/network.h

@@ -166,6 +166,7 @@ bool NetworkChangeCompanyPassword(byte argc, char *argv[]);
 void NetworkPopulateCompanyInfo(void);
 void UpdateNetworkGameWindow(bool unselect);
 void CheckMinPlayers(void);
+void NetworkStartDebugLog(const char *hostname, uint16 port);
 
 void NetworkStartUp(void);
 void NetworkUDPCloseAll();