More work on transition to shipping zones; help box is shown in methods;

assets/css/admin-styles.css

assets/js/shipping-by-rules-config.js

includes/admin/html/html-upgrade-nag.php

includes/admin/settings/meta-box-help.php

includes/rules-shipping-method.php

includes/rules_shipping_framework_woocommerce.php

includes/rules_shipping_framework_woocommerce_advanced.php

woocommerce-advanced-shipping-by-rules.php

woocommerce-shipping-by-rules.php