(debtors filed Chapter 12 and claimed TX farmland as exempt homestead property; trustee objected on basis that debtors domicile was in LA and, thus, TX exemption inapplicable; under 11 U.S.C. Sec. 522(b)(1), debtors not domiciled in a single state for the 730 days immediately preceding bankruptcy filing, but domiciled in LA for the 180-day period immediately preceding the 730-day period based on objective evidence).