CB Paid Subscriptions

The following additional benefits were implemented.

1. Checkouts with partial invoicing addresses can now automatically be completed from corresponding CB fields, either only at first checkout (as before), or now also at every checkout. CB fields for invoice addresses can now be mapped and populated automatically even when invoice address is not presented at checkout.
2. This eases the burden on customers for sites where the invoicing address is handled only in the user profile, and gives admins access to all CB Fields features for invoice addresses (e.g. restricting invoicing country, among others).
3. 3+-worded names are now split consistently with the rest of CB.