REFACTOR/BUG bill_to moved to billing profile
Wanted BillingProfile to know all the billingprofile concerns.
In doing so revealed that has_one relationships from belongs_to to
has_one isn't set until the object with has_one is saved.
This was causing a bug in my test suite which I fixed.
bill_to now uses the pointer from belong_to to has_one so best fixed.
REFACTOR Cut and past error