removed deepcopy as it was not needed and created a memoryleak during…

… export.

pupil_src/player/scan_path.py

@@ -13,7 +13,6 @@
 import numpy as np
 from pyglui import ui
 from methods import denormalize,normalize
-from copy import deepcopy
 import logging
 logger = logging.getLogger(__name__)
 
@@ -91,8 +90,7 @@ def update(self,frame,events):
         #update info for next frame.
         self.prev_gray = gray_img
         self.prev_frame_idx = frame.index
-        # copy the data/contents of recent_gaze_positions don't make a reference
-        self.past_gaze_positions = deepcopy(events['gaze_positions'])
+        self.past_gaze_positions = events['gaze_positions']
 
     def init_gui(self):
         # initialize the menu