test points
   0.5 0.7
   0.6 9.4
   1 4
   2 4
   4 1
   5 8
   8 0.5
   9 0.5
   9 6
test first set   (2,1),(9,8)
test operator = (2,1),(9,8)
test cctor      (2,1),(9,8)
test list insertion:
  number of successfully inserted points is 9
  LER is  (2,1),(9,8)
test default ctor    (0,0),(1,0.5)
test after removal   (2,1),(9,8)
test successful insertion 1
test after clear (0.6,0),(10,10)
test unsuccessful insertion 0
test bounding box (0,0),(10,10)
test left_bottom_right_top is 0.6 9.4,  0 0,  10 0,  10 10
