Add system/flash_eraseall NSH command

configs/mikroe-stm32f4/usbnsh/defconfig

@@ -807,12 +807,12 @@ CONFIG_SYSTEM_FLASH_ERASEALL=y
 #
 # FLASH Test Command
 #
-CONFIG_SYSTEM_FLASH_TEST=y
+CONFIG_EXAMPLES_FLASH_TEST=y
 
 #
 # SMART Filesystem Test Command
 #
-CONFIG_SYSTEM_SMART_TEST=y
+CONFIG_EXAMPLES_SMART_TEST=y
 
 #
 # readline()

include/sys/statfs.h

 /****************************************************************************
  * include/sys/statfs.h
  *
- *   Copyright (C) 2007-2009, 2011 Gregory Nutt. All rights reserved.
+ *   Copyright (C) 2007-2009, 2011-2013 Gregory Nutt. All rights reserved.
  *   Author: Gregory Nutt <gnutt@nuttx.org>
  *
  * Redistribution and use in source and binary forms, with or without