Add-ons XR Product Manager 2.0.1

Just fixing some of the pesky bugs that surfaced since the release of 2.0.0

• Fix xf_xr_pm_product doesn't exist error after uninstalling the add-on and removing payment profiles.
• Ensure category permissions are rebuilt after a new category is created.
• Remove code pointing to a method that no longer exists.
• Display a more sane error when a product has no valid versions to download.
• Display session activity when viewing products.
• Ensure the ability to stop emails works correctly