- Switch master server protocol to dpmaster for better game separation. Based partly on patch by Zack Middleton

- Get rid of ugly cvars sv_heartbeat and cl_gamename and replace with single com_gamename
- Remove sv_flatline. Flatlines are ignored by dpmaster and are considered to be insecure because flatlines can be udp-spoofed.

code/qcommon/common.c

@@ -85,6 +85,7 @@ cvar_t	*com_minimized;
 cvar_t	*com_maxfpsMinimized;
 cvar_t	*com_abnormalExit;
 cvar_t	*com_standalone;
+cvar_t	*com_gamename;
 cvar_t	*com_protocol;
 #ifdef LEGACY_PROTOCOL
 cvar_t	*com_legacyprotocol;
@@ -2793,6 +2794,7 @@ void Com_Init( char *commandLine ) {
 
 	s = va("%s %s %s", Q3_VERSION, PLATFORM_STRING, __DATE__ );
 	com_version = Cvar_Get ("version", s, CVAR_ROM | CVAR_SERVERINFO );
+	com_gamename = Cvar_Get("com_gamename", GAMENAME_FOR_MASTER, CVAR_SERVERINFO | CVAR_INIT);
 	com_protocol = Cvar_Get("com_protocol", va("%i", PROTOCOL_VERSION), CVAR_SERVERINFO | CVAR_INIT);
 #ifdef LEGACY_PROTOCOL
 	com_legacyprotocol = Cvar_Get("com_legacyprotocol", va("%i", PROTOCOL_LEGACY_VERSION), CVAR_INIT);