Tidy up some lidar stuff for testing and clarity.

tracking/lidar_loader.py

@@ -1,3 +1,11 @@
+# -*- coding: utf-8 -*-
+"""
+This module is a utility to load and save lidar 
+scans to disk. 
+As such, it is useful for testing, to create real lidar
+data that can be reused later, without needing to connect the lidar.
+"""
+
 from rplidar import RPLidar
 import pickle