Republican Gov. Charlie Baker has released state broadband grants to six more rural towns that plan to build their own high-speed fiber-to-the-home networks. Announced Wednesday were $6.8 million in direct infrastructure grants to Charlemont, Colrain, Cummington, Heath, New Salem, Otis, and Rowe. Earlier this month, the Baker-Polito administration awarded $4.6 millionto Ashfield, Leyden, Mt. Washington, Plainfield, Shutesbury, and Windsor.