KIEV (Reuters) - Family and friends of Reuters cameraman Taras Protsyuk gathered in Kiev on Thursday to mark a year since he was killed by U.S. troops in Baghdad amid calls on Washington to probe further the deaths of journalists in Iraq Protsyuk, a Ukrainian, and Jose Couso, a cameraman with Spanish television Telecinco, died when a U.S. tank fired a shell into the Palestine Hotel, where most foreign media were staying during the U.S.-led invasion. Couso's brother laid flowers in his memory in the Iraqi capital and demanded those responsible be brought to account. Tarek Ayoub, of Qatar-based Al...