Clarified BinningImageFilter::GenerateOutputInformation which was unreadable. Added check on dimension.
Clarified BinningImageFilter::GenerateOutputInformation which was
unreadable. Added check on dimension.

dsarrut/RTK,ipsusila/RTK,ipsusila/RTK,ipsusila/RTK,dsarrut/RTK,fabienmomey/RTK,SimonRit/RTK,ldqcarbon/RTK,ldqcarbon/RTK,ipsusila/RTK,SimonRit/RTK,fabienmomey/RTK,SimonRit/RTK,dsarrut/RTK,fabienmomey/RTK,ldqcarbon/RTK,dsarrut/RTK,dsarrut/RTK,ldqcarbon/RTK,ldqcarbon/RTK,fabienmomey/RTK,fabienmomey/RTK,ldqcarbon/RTK,ipsusila/RTK,ipsusila/RTK,ldqcarbon/RTK,fabienmomey/RTK,SimonRit/RTK,dsarrut/RTK,ipsusila/RTK,dsarrut/RTK,fabienmomey/RTK