change task identifier in node attributes

Instead of

{"class": "package.module.MyTask"}
{"method": "package.module.mymethod"}
{"ppfport": True}
{"task": "package.module.MyWidget", "task_generator": "package.module.widget_to_task"}

do this

{"task_type": "class", "task_identifier": "package.module.MyTask"}
{"task_type": "method", "task_identifier": "package.module.mymethod"}
{"task_type": "ppfport"}
{"task_type": "generated", "task_identifier": "package.module.MyWidget", "task_generator": "package.module.widget_to_task"}