Tax law changes that were supposed to make it easier to create senior-subordinated structures for securities backed by home-equity lines of credit appear to have done little to alter the market. In fact, analysts report, investor appetite for wrapped HELOC deals remains high. Traditionally, HELOC deals have relied on bond insurance for their credit enhancement, and 2005 hasn’t seen much deviation from that trend. According to data compiled by Inside MBS & ABS, seven…