add a big notice about using config.local.php

config.inc.php

@@ -15,6 +15,23 @@
  * Contains configuration options.
  */
 
+
+################################################################################
+#                                                                              #
+#    PostfixAdmin default configuration                                        #
+#                                                                              #
+#    This file contains the PostfixAdmin default configuration settings.       #
+#                                                                              #
+#    Please do not edit this file.                                             #
+#                                                                              #
+#    Instead, add the options you want to change/override to                   #
+#    config.local.php (if it doesn't exist, create it).                        #
+#    This will make version upgrades much easier.                              #
+#                                                                              #
+################################################################################
+
+
+
 /*****************************************************************
  *  !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! 
  * You have to set $CONF['configured'] = true; before the