By Stefica Nicol Bikes and James ?Redmayne SYDNEY, ?Feb 8 (Reuters) - A ?white supremacist who killed 51 Muslim ?worshippers and injured dozens at two mosques ?in New Zealand will ?begin an appeal hearing against ?his ?sentence on Monday. Brenton Tarrant, 35, opened fire on two mosques in Christchurch in March 2019, in the worst mass shooting in the ?country's history. He was convicted of 51 charges of ?murder, ?40 counts of attempted ?murder ?and one charge of committing a terrorist act and is serving a life sentence in prison without parole. It was the first time a New Zealand...