The Gay Head Light relocation project will be referred to the Martha’s Vineyard Commission for possible review as a development of regional impact, the Aquinnah planning board decided this week. And discussions remain ongoing between the town and abutters who will be affected when the lighthouse is moved sometime next year. “This whole process is in motion,” planning board chairman Peter Temple said at a public hearing Tuesday. The board voted formally to refer the project to the MVC, although the commission has already said informally that it may pass on the review since the project is already under detailed review by the town, state and tribe.