support new 'relative_motion_frame' boolean user attribute on options node to allow specification of 'motion_start_frame' and 'motion_end_frame' relatively to 'frame'
support new 'relative_motion_frame' boolean user attribute on options node to allow specification of 'motion_start_frame' and 'motion_end_frame' relatively to 'frame'

gatgui/SeExprArnold,gatgui/SeExprArnold