- Greatly improve UDP downloading speed for clients

- Add download rate control cvar sv_dlRate
- Don't send snapshots to downloading clients

code/qcommon/qcommon.h

@@ -192,8 +192,9 @@ void		NET_Sleep(int msec);
 #define	MAX_MSGLEN				16384		// max length of a message, which may
 											// be fragmented into multiple packets
 
-#define MAX_DOWNLOAD_WINDOW			8		// max of eight download frames
-#define MAX_DOWNLOAD_BLKSIZE		2048	// 2048 byte block chunks
+#define MAX_DOWNLOAD_WINDOW		48	// ACK window of 48 download chunks. Cannot set this higher, or clients
+						// will overflow the reliable commands buffer
+#define MAX_DOWNLOAD_BLKSIZE		1024	// 896 byte block chunks
  
 
 /*
@@ -1029,6 +1030,7 @@ void SV_Frame( int msec );
 void SV_PacketEvent( netadr_t from, msg_t *msg );
 int SV_FrameMsec(void);
 qboolean SV_GameCommand( void );
+int SV_SendDownloadMessages(void);
 
 
 //