Rename ReorderTransformationBases to ReorderTransformationSubstitution.  
This reflects the fact that it contains the machinary specific to the
substitution method of executing BGPs.

git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1526999 13f79535-47bb-0310-9956-ffa450edef68
Add toString.

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git-svn-id: https://svn.apache.org/repos/asf/jena/trunk@1527001 13f79535-47bb-0310-9956-ffa450edef68