After a national conglomerate bought Stonington Institute for $40 million in 2004, the residential drug treatment facility in Southeastern Connecticut immediately set out to expand. Step one: appoint attorney and former Republican state Sen. William Aniskovich chief executive.Step two: build a 36-bed adolescent psych hospital in Ledyard, which a Law Tribune analysis showed would have generated at least $600,000 in operating surpluses in the first three years of business, much more than the meager $13,000 the company projected for state regulators.Step three: open new psych services in Willimantic and Danielson. Steps two and three aren’t exactly coming off as planned.