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