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/lwmon.h b/include/configs/lwmon.h
index d52a5e0..8f00773 100644
--- a/include/configs/lwmon.h
+++ b/include/configs/lwmon.h
@@ -93,7 +93,7 @@
  * 3 = 0x3C+0x3F = F3 + F6 :	enable test mode
  */
 
-#define CONFIG_BOOTCOMMAND "autoscr 40040000;saveenv"
+#define CONFIG_BOOTCOMMAND "source 40040000;saveenv"
 
 /*	"gatewayip=10.8.211.250\0"			                \ */
 #define	CONFIG_EXTRA_ENV_SETTINGS					\
@@ -108,7 +108,7 @@
 	"key_magic2=3A+3C\0"						\
 	"key_cmd2=echo *** Entering Update Mode ***;"			\
 		"if fatload ide 0:3 10000 update.scr;"			\
-			"then autoscr 10000;"				\
+			"then source 10000;"				\
 			"else echo *** UPDATE FAILED ***;"		\
 		"fi\0"							\
 	"key_magic3=3C+3F\0"						\