By Marc Frank HAVANA (Reuters) – Cuban rescue workers on Saturday picked through rubble for bodies and possible survivors after a Havana boutique hotel was devastated by what authorities said was a gas explosion, leaving at least 26 dead. The blast at the Hotel Saratoga, just a block from the iconic capitol building in a renovated area of downtown Havana, seriously damaged two adjoining upscale apartment buildings and inflicted lighter damage to 17 structures within a two-block radius. Debris fell on pedestrians in the heavily traveled area and glass and debris went flying at a nearby grammar …