By Susana Vera and Guillermo Martinez VALENCIA, Spain (Reuters) -The deadliest flash floods in Spain’s modern history have killed at least 214 people and dozens were still unaccounted for, four days after torrential rains swept the eastern region of Valencia, Prime Minister Pedro Sanchez said on Saturday. In a televised statement, Sanchez said the government was sending 5,000 more army troops to help with the searches and clean-up in addition to 2,500 soldiers already deployed. […]