PROVIDENCE — Starting in May, the Raimondo administration plans to dock Medicaid payments to dozens of nursing homes that have not "voluntarily'' reimbursed the state for $84.3 million in payments they were advanced to hold them over while the applications of scores of prospective nursing home patients were snagged by the state’s balky "UHIP" computer system.Most of the homes in this extended tug-of-war with the state's Executive Office of Health & Human Services [...]