Add "source" command; prepare removal of "autoscr" command

According to the doc/feature-removal-schedule.txt, the "autoscr"
command will be replaced by the "source" command in approximately 6
months from now.

This patch prepares this change and starts a 6 month transition
period as follows:

- The new "source" command has been added, which implements exactly
  the same functionlaity as the old "autoscr" command before
- The old "autoscr" command name is kept as an alias for compatibility
- Command sequences, script files atc. have been adapted to use the
  new "source" command
- Related environment variables ("autoscript", "autoscript_uname")
  have *not* been adapted yet; these will be renamed resp. removed in
  a separate patch when the support for the "autoscr" command get's
  finally dropped.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/sc3.h b/include/configs/sc3.h
index 5b68ef9..97e1da2 100644
--- a/include/configs/sc3.h
+++ b/include/configs/sc3.h
@@ -122,7 +122,7 @@
 	"rootpath=/opt/eldk/ppc_4xx\0"					\
 	"bootfile=/tftpboot/sc3/uImage\0"				\
 	"u-boot=/tftpboot/sc3/u-boot.bin\0"				\
-	"setup=tftp 200000 /tftpboot/sc3/setup.img;autoscr 200000\0"	\
+	"setup=tftp 200000 /tftpboot/sc3/setup.img;source 200000\0"	\
 	"kernel_addr=FFE08000\0"					\
 	""
 #undef CONFIG_BOOTCOMMAND
@@ -186,20 +186,20 @@
 #include <config_cmd_default.h>
 
 
-#define CONFIG_CMD_AUTOSCRIPT
-#define CONFIG_CMD_PCI
-#define CONFIG_CMD_IRQ
-#define CONFIG_CMD_NET
-#define CONFIG_CMD_MII
-#define CONFIG_CMD_PING
-#define CONFIG_CMD_NAND
-#define CONFIG_CMD_JFFS2
-#define CONFIG_CMD_I2C
-#define CONFIG_CMD_IDE
+#define CONFIG_CMD_CACHE
 #define CONFIG_CMD_DATE
 #define CONFIG_CMD_DHCP
-#define CONFIG_CMD_CACHE
 #define CONFIG_CMD_ELF
+#define CONFIG_CMD_I2C
+#define CONFIG_CMD_IDE
+#define CONFIG_CMD_IRQ
+#define CONFIG_CMD_JFFS2
+#define CONFIG_CMD_MII
+#define CONFIG_CMD_NAND
+#define CONFIG_CMD_NET
+#define CONFIG_CMD_PCI
+#define CONFIG_CMD_PING
+#define CONFIG_CMD_SOURCE
 
 
 #undef CONFIG_WATCHDOG			/* watchdog disabled		*/