mailsplit: -d<prec>

Instead of the default 4 digits with leading zeros, different precision
can be specified for the generated filenames.

Signed-off-by: Junio C Hamano <junkio@cox.net>

git-applymbox.sh

@@ -42,7 +42,8 @@ case "$continue" in
 '')
 	rm -rf .dotest
 	mkdir .dotest
-	git-mailsplit "$1" .dotest || exit 1
+	num_msgs=$(git-mailsplit "$1" .dotest) || exit 1
+	echo "$num_msgs patch(es) to process."
 	shift
 esac