Made sure path tracer is always default even for batch mode. Also AA samples set to 1 if not set for branched path mode.
Made sure path tracer is always default even for batch mode. Also AA samples set to 1 if not set for branched path mode.

andrewkaufman/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,johnhaddon/gaffer,andrewkaufman/gaffer,andrewkaufman/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,andrewkaufman/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,johnhaddon/gaffer,GafferHQ/gaffer,GafferHQ/gaffer