E-Commerce Back Porting from CVS to 4.7

As this is the early stage of the E-Commerce development for 4.8, a lot of modules can be still run on 4.7 without any problems. This is a guide to help people who need to use a 4.8(CVS) E-Commerce modules on 4.7

Modules that cannot be copied from E-Commerce CVS to 4.7

1. product module: The product module has been updated to include the new link api changes. This will stop the "add to cart" link not to appear on products.
2. payment module: With the new formapi inclusions for building the credit card pages easily with only a few form elements. The credit card expiry date calls the theme('form_element') which has been changed between 4.7 and 4.8
3. product module: product_node_info()'s return value has changed.

Other issues that may cause issues

1. All modules: With the changes to the new admin pages, the modules path has changed from admin/modules to admin/settings/modules so any descriptions on the modules pages will not show.
2. All modules: CVS has now renamed the form_render() to drupal_render(). This can just be renamed back.