Line Dispute Would Make Connecticut's Gain Rhode Islander's Pain
Satellite survey casts doubt on 19th-century surveys that have served to define border between Rhode Island and Connecticut, placing several dozen resident of Hopkinson, RI, in North Stonington, Conn; this would increase tax base of North Stonington at expense of Hopkinton; consensus is growing to let imperfections of past overrule more technically perfect present; photo; map (M)