The subprime securitization market appears headed for a banner year. In fact, a strong first quarter has put the sector on pace to register what could be its best performance in three years. According to a new Inside B&C Lending ranking of the top issuers and underwriters, a hefty $15.84 billion in securities backed by subprime mortgages came to market during the first three months of this year. That’s the busiest the sector has been