git-stash: use stdout instead of stderr for non error messages

Some scripts and libraries check stderr to detect a failing command,
instead of checking the exit code.  Because the output from git-status
is not primarily for machine consumption, it would not hurt to send
these messages to stdout instead and it will make it easier to drive
the command for such callers.

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

git-stash.sh

@@ -86,7 +86,7 @@ save_stash () {
 
 	if no_changes
 	then
-		echo >&2 'No local changes to save'
+		echo 'No local changes to save'
 		exit 0
 	fi
 	test -f "$GIT_DIR/logs/$ref_stash" ||
@@ -99,7 +99,7 @@ save_stash () {
 
 	git update-ref -m "$stash_msg" $ref_stash $w_commit ||
 		die "Cannot save the current status"
-	printf >&2 'Saved working directory and index state "%s"\n' "$stash_msg"
+	printf 'Saved working directory and index state "%s"\n' "$stash_msg"
 }
 
 have_stash () {
@@ -229,7 +229,7 @@ create)
 	if test $# -eq 0
 	then
 		save_stash &&
-		echo >&2 '(To restore them type "git stash apply")' &&
+		echo '(To restore them type "git stash apply")' &&
 		git-reset --hard
 	else
 		usage