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/grsim.h b/include/configs/grsim.h
index a9eaa4a..c3f1a31 100644
--- a/include/configs/grsim.h
+++ b/include/configs/grsim.h
@@ -65,23 +65,23 @@
 /*
  * Supported commands
  */
-#define CONFIG_CMD_AMBAPP	/* AMBA Plyg&Play information   */
-#define CONFIG_CMD_AUTOSCRIPT	/* Autoscript Support           */
-#define CONFIG_CMD_BDI		/* bdinfo                       */
-#define CONFIG_CMD_CONSOLE	/* coninfo                      */
+#define CONFIG_CMD_AMBAPP	/* AMBA Plyg&Play information	*/
+#define CONFIG_CMD_BDI		/* bdinfo			*/
+#define CONFIG_CMD_CONSOLE	/* coninfo			*/
 #define CONFIG_CMD_DIAG
-#define CONFIG_CMD_ECHO		/* echo arguments               */
-#define CONFIG_CMD_FPGA		/* FPGA configuration Support   */
+#define CONFIG_CMD_ECHO		/* echo arguments		*/
+#define CONFIG_CMD_FPGA		/* FPGA configuration Support	*/
 #define CONFIG_CMD_IRQ
-#define CONFIG_CMD_ITEST	/* Integer (and string) test    */
-#define CONFIG_CMD_LOADB	/* loadb                        */
-#define CONFIG_CMD_LOADS	/* loads                        */
+#define CONFIG_CMD_ITEST	/* Integer (and string) test	*/
+#define CONFIG_CMD_LOADB	/* loadb			*/
+#define CONFIG_CMD_LOADS	/* loads			*/
 #define CONFIG_CMD_MISC		/* Misc functions like sleep etc */
-#define CONFIG_CMD_NET		/* bootp, tftpboot, rarpboot    */
+#define CONFIG_CMD_NET		/* bootp, tftpboot, rarpboot	*/
 #define CONFIG_CMD_REGINFO
-#define CONFIG_CMD_RUN		/* run command in env variable  */
-#define CONFIG_CMD_SETGETDCR	/* DCR support on 4xx           */
-#define CONFIG_CMD_XIMG		/* Load part of Multi Image     */
+#define CONFIG_CMD_RUN		/* run command in env variable	*/
+#define CONFIG_CMD_SETGETDCR	/* DCR support on 4xx		*/
+#define CONFIG_CMD_SOURCE	/* "source" command support	*/
+#define CONFIG_CMD_XIMG		/* Load part of Multi Image	*/
 
 /*
  * Autobooting