BEIJING (Reuters) - Forced evictions in China, a major source of social discontent, have risen significantly in the past two years as local officials and property developers colluded to seize and sell land to pay off government debt, Amnesty International said on Thursday. Property disputes in a country where the government legally owns all land are often violent and have led to growing social instability, one of the challenges facing a new generation of Chinese leaders, led by Vice-President Xi Jinping. ...