Greenwire: A little-known but important regulator is scaling back some of its aggressive restrictions on natural gas drilling as the four governors who oversee the agency weigh in how to balance gas drilling and water quality in the Marcellus Shale. Most notably, the Delaware River Basin Commission, or DRBC, is reducing the amount of money it will require drillers to set aside for environmental cleanup and regulation. Previous drafts, according to a source, had recommended requiring a $5 …