The Cuban government has loosened travel restrictions on some of the island's best-known dissidents, granting them one-time permission to travel abroad ahead of President Barack Obama's trip to the island, activists said Wednesday. [...] Members of a group of 11 dissidents imprisoned during the 2003 crackdown known as the Black Spring said Wednesday that officials have told seven of them that they will be free to travel one time as a reward for good behavior. Four more-politically active members of the group remain unable to travel, the dissidents said. Activist Marta Beatriz Roque said that she and six other former...