Fixed major bug: drivers that accepted size arguments could wind

up with more than 80 characters (20x4) in their display, and thus
overwrite memory outside of the allocated 80 characterwframebuffer.

For example, using a 20x6 screen would do this.

All drivers now either ignore a missing framebuffer, or allocate it
themselves - the latter is prefered.

server/drivers/CFontz.c

@@ -187,11 +187,6 @@ CFontz_init (lcd_logical_driver * driver, char *args)
 	CFontz_autoscroll (0);
 	CFontz_backlight (backlight_brightness);
 
-	if (!driver->framebuf) {
-		syslog(LOG_ERR, "cfontz_init: no frame buffer!");
-		CFontz_close ();
-		return -1;
-	}
 	// Set the functions the driver supports...
 
 	driver->clear = CFontz_clear;