TANZANIA's opposition leader and potential presidential candidate Tundu Lissu arrived home on Monday from Belgium where he took exile and underwent treatment after being shot three years ago. Lissu, 52, was met at an airport in the commercial capital Dar es Salaam by relatives, political allies and thousands of supporters from his party CHADEMA. A fierce critic of President John Magufuli's government, he was shot 16 times, mostly in the lower abdomen, in an attack by unknown gunmen in the administrative capital Dodoma in September 2017. At the time, Magufuli condemned the shooting and ordered security forces to investigate, but…