BERNBURG, Germany (Reuters) - Helmut Rieche, the proud mayor of this struggling east German town, likes to focus on the positive when describing the changes that have occurred here since the collapse of communism. The old state-run cement company that polluted the river and turned the town gray with fumes has been closed down, he says. And the elderly of Bernburg, who Rieche says seemed hidden from view under the communists, are out on the streets again. "We have about 250 citizens that are over 90 years old. The people are living longer and that is a sign that they...