Aspiring prime minister and political heavyweight Tarique Rahman was welcomed back to Bangladesh on Thursday by huge crowds of joyous supporters after 17 years in self-imposed exile.Rahman, the son of former prime minister Khaleda Zia and heir apparent of the Bangladesh Nationalist Party (BNP), shook hands with party leaders after touching down at the Dhaka airport.Accompanied by his wife and daughter, a visibly emotional Rahman took off his shoes, stood on the grass outside the airport and...