While most of the talk recently has focused on the future of its parent, GMAC, Residential Funding Corp. has quietly launched a series of upgrades to its AlterNet subprime mortgage program. “These significant improvements to our AlterNet program allow mortgage lenders and correspondents to offer more real estate financing choices for consumers,” said Anne Peacock, RFC’s managing director for product and business strategy management, in a statement that outlined a host of product enhancements…