Constructor works! But something scrambled ...

Running

java E13Rectangle  -test
E13Rectangle program reads in X and Y coordinates for two points and outputs
  the area and perimeter of a rectangle where both points are opposite corners.
-test procedure, use hard coded points:

	test#1 supply point (1,1) and (21,11) that is bottom left and top right
	test#1 expect that this will stored as (1,11) and (21,1).
	test#1 expect area = 200 units squared and perimeter 10 + 20 + 10 + 20 = 60 units.
	test#1 myRectangle.coordString()=rectangle: upper left (1.0,21.0) to (11.0,1.0)

X and y swapped???