From the Globe this morning: Your house is set to become a sprawling, and cheap, computer network... "Ninety technology companies — including Cisco Systems Inc., Intel Corp. and Motorola Inc. — are part of a group that announced a major breakthrough Tuesday in the years-long push to use power lines to transmit data. As early as October, consumers in Canada and the United States will be able to use any plug in their house to connect computers to each other and to the Web. No extra wiring will be required."