See also fix sent upstream :
https://sourceforge.net/tracker/?func=detail&aid=3571921&group_id=240806&atid=1114094

This enables compilation on MacOSX 10.8, and (most probably) with Intel Compiler also

BUG: dynamic_cast fails when image is not of type OutputImageType. Replacing the GetProjectionRef() call since it is the only one requiring the dynamic cast

TEST: update otbConfusionMatrixCalculatorUpdate test, just overall accuracy value is checked for now