Send non-file output from blackbox_cat to STDERR

bin/blackbox_edit_start

@@ -11,7 +11,7 @@ source "${blackbox_home}/_blackbox_common.sh"
 for param in """$@""" ; do
   unencrypted_file=$(get_unencrypted_filename "$param")
   encrypted_file=$(get_encrypted_filename "$param")
-  echo ========== PLAINFILE '"'$unencrypted_file'"'
+  echo >&2 ========== PLAINFILE '"'$unencrypted_file'"'
 
   fail_if_not_on_cryptlist "$unencrypted_file"
   fail_if_not_exists "$encrypted_file" "This should not happen."
@@ -19,7 +19,7 @@ for param in """$@""" ; do
     rm -f "$unencrypted_file"
   fi
   if [[ -f "$unencrypted_file" ]]; then
-    echo SKIPPING: "$1" "Will not overwrite non-empty files."
+    echo >&2 SKIPPING: "$1" "Will not overwrite non-empty files."
     continue
   fi