separate the loading of jQuery and jQueryUI in their own <script> blocks so jQuery is available when detecting jQuery UI
add custom/default styling to jQuery UI widgets
check if these constants are available (these are not on a fresh/clean app installation)
add compatibility tep_get_ip_address() function which was first added in v2.3.0
add selected_box GET parameter to open the paypal box when the app is used
add compatibility template_top and template_bottom files for v2.2RC2a