- fix a potential file descriptor leak in server side of pak downloading

- add new functions for banning clients from server, in engine part. This will also make it possible to ban ipv6 addresses in old mods.

code/qcommon/qcommon.h

@@ -583,6 +583,7 @@ int		FS_GetFileList(  const char *path, const char *extension, char *listbuf, in
 int		FS_GetModList(  char *listbuf, int bufsize );
 
 fileHandle_t	FS_FOpenFileWrite( const char *qpath );
+fileHandle_t	FS_FOpenFileAppend( const char *filename );
 // will properly create any needed paths and deal with seperater character issues
 
 int		FS_filelength( fileHandle_t f );