Changes from 0.1 to 0.2
---------------------------
* Moved CardinalityConstraint and trasformation typeclasses from 
  Data.CardinalityRange to new dedicated module Data.Cardinality.ContTrans
* Data.Cardinality      -> Data.Cardinality.Cardinality
* Data.CardinalityRange -> Data.Cardinality.CardinalityRange
* Data.Cardinality is now just exporting
        Data.Cardinality.Cardinality
        Data.Cardinality.CardinalityRange
        Data.Cardinality.ContTrans
* To Data.Cardinality.ContTrans added ContTransError data structure and 
  functions sContTrans_E and sContTransT_E. With these functions it's now 
  possible a more informative error then it was Nothing with plain sContTrans.