EAST GERMANS' NEW LEADER VOWS FAR-REACHING REFORM AND URGES AN END TO FLIGHT
LEAD: Two days after conferring with President Mikhail S. Gorbachev in Moscow, Egon Krenz, the new East German leader, returned home and pleaded with his citizens today to stop fleeing the country, promising far-reaching reforms and announcing the dismissal of five senior Politburo members.