Issue 1104: increase consistency in overlaps, intersects and contains
Issue 1104: #intersectRectangles does the same thing as #overlap(Rectangle,Rectangle)
reorder methods
chain individual statements together
some informal tests to illustrate the difference in #contains and #overlaps between the various regions
issue-1104 touching circles do not overlap
issue-1104 points on the border count as 'contained'
issue-1104 touching BoundingBoxes are not 'contained', rewrite BoundingBox#contains in same form as others
issue-1104 add Circle#contains(Circle)