Radical changes to the legal aid system will put an end to defence lawyers being paid up to $900,000 a year from the public purse.Accused criminals whose legal bills are paid by the taxpayer will no longer be able to choose who represents them in court.Instead, lawyers - paid between $105 and $182 an hour - will be put on a roster to be assigned cases.A scathing report by Dame Margaret Bazley, which led to…