test points
   0 1
   0 4
   0 10
   1 1
   2 2
   3 3
   4 0
   4 8
   5 6
   7 0
   8 4
test first set   (5,0),(8,10)
test operator = (5,0),(8,10)
test cctor      (5,0),(8,10)
test list insertion:
  number of successfully inserted points is 10
  LER is  (5,0),(8,10)
test default ctor    (0,0),(1,0.5)
test after removal   (0,4),(10,8)
test successful insertion 1
test after clear (0,0),(10,6)
test unsuccessful insertion 0
test bounding box (0,0),(10,10)
test left_bottom_right_top is 0 0,  10 0,  10 10,  5 6
