By Karen Lema and Neil Jerome Morales MANILA (Reuters) -Ferdinand Marcos, the son of the Philippine ruler overthrown in a popular uprising 36 years ago, was sworn in as the country’s president on Thursday, promising to strive for unity and a better future while praising his late father’s legacy. Marcos, 64, won last month’s election in a landslide, capping off his wealthy family’s decades-long quest to regain the presidency and transform its image after it was driven out in 1986. “We are here to repair a house divided, to make it whole and to stand strong again,” he said in an inauguration spe…