DefaultMapLayer-constructor that passes GeneralParameterValue[] for an AbstractGridCoverage2DReader - Removes deprectaed "throws org.geotools.feature.IllegalAttributeException" also

1. As discussed in
[Geotools-devel] New MapLayer constructor to pass GeneralParameterValue[] reader paramters
this patch adds a constructor to pass GeneralParameterValue[]s like transparency when creating a MapLayer for an AbstractGridCoverage2DReader

2.Removes deprecated and unused "throws org.geotools.feature.IllegalAttributeException" from all constructors in DefaultMapLayer