Moved AffineTransform2D to the "j2d" internal package, for making clearer its dependency toward Java2D
and for allowing reuse by other packages than org.apache.sis.referencing.operation.transform.


git-svn-id: https://svn.apache.org/repos/asf/sis/branches/JDK8@1600698 13f79535-47bb-0310-9956-ffa450edef68