(debtor bought land from friend under installment contract which allowed friend to make advancements for certain expenses associated with the land with any advancements to be added to the principal due; friend made significant additional loans and debtor later filed bankruptcy and trustee sought to sell the land free and clear of all encumbrances, but friend wanted additional loan amounts to be added to principal on basis that such amounts were advancements; creditor failed to prove that loans were advancements that were secured by the land; trustee entitled to sell land free and clear of all liens).