By Bill Owney All those who believed in Saturn — General Motors’ subsidiary that attacks the imports by offering world-class customer service and no-haggle pricing — are finally seeing their judgment verified. GM surprised Wall Street last week with a second-quarter profit of $891 million (versus a $3.4 billion loss a year ago). The credit and debits that produced that sum are a complex picture. Most of the profit came from Europe, where the Opel division’s turnaround has been a robust success. Stateside, where two-thirds of its market resides, the General essentially ...