Coppélia's comeback
Swanilda teaches old Coppelius a lesson about living dolls. Photos: Rosalie O'Connor.Few ballets are as lovable as Coppélia, particularly in the Balanchine version, which Boston Ballet is reviving through this weekend at the Opera House. Not that the great Mr. B really investigates the quirky subtexts of the ballet's libretto - which is sourced in one of the darker musings of E.T.A. Hoffmann, that peculi…