def to_s
      result = "Track \n"
      result << "\tName: #{name}\n"
      result << "\tComment: #{comment}\n"
      result << "\tDescription: #{description}\n"
      result << "\tSize: #{points.size} points\n"
      result << "\tSegments: #{segments.size} \n"
      result << "\tDistance: #{distance} km\n"
      result << "\tMoving duration: #{moving_duration} km\n"
      result << "\tLowest Point: #{lowest_point.elevation} \n"
      result << "\tHighest Point: #{highest_point.elevation}\n "
      result << "\tBounds: #{bounds}"
      result
    end
def to_s
      result = "Track \n"
      result << "\tName: #{name}\n"
      result << "\tComment: #{comment}\n"
      result << "\tDescription: #{description}\n"
      result << "\tSize: #{points.size} points\n"
      result << "\tSegments: #{segments.size} \n"
      result << "\tDistance: #{distance} km\n"
      result << "\tMoving duration: #{moving_duration} km\n"
      result << "\tLowest Point: #{lowest_point.elevation} \n"
      result << "\tHighest Point: #{highest_point.elevation}\n "
      result << "\tBounds: #{bounds}"
      result
    end
Prints out a friendly summary of this track (sans points).  Useful for
 debugging and sanity checks.