added EqualityFunctor simplified algorithm by means of Kovalevsky's idea to use   image iterator and scan order iterator simultaneously
added EqualityFunctor
simplified algorithm by means of Kovalevsky's idea to use
  image iterator and scan order iterator simultaneously

mmuellner/vigra,psteinb/vigra,hmeine/vigra,martinsch/vigra,dagophil/vigra,mmuellner/vigra,cbecker/vigra,timoMa/vigra,psteinb/vigra,cha007/vigra,cha007/vigra,hmeine/vigra,dstoe/vigra,ThomasWalter/vigra,cha007/vigra,funkey/vigra,capturePointer/vigra,ThomasWalter/vigra,ThomasWalter/vigra,cha007/vigra,kod3r/vigra,timoMa/vigra,mmuellner/vigra,hmeine/vigra,capturePointer/vigra,dagophil/vigra,capturePointer/vigra,xiwei-zhang/vigra,psteinb/vigra,funkey/vigra,DaveRichmond-/vigra,xiwei-zhang/vigra,stuarteberg/vigra,mmuellner/vigra,hmeine/vigra,stuarteberg/vigra,xiwei-zhang/vigra,stuarteberg/vigra,funkey/vigra,timoMa/vigra,dagophil/vigra,DaveRichmond-/vigra,timoMa/vigra,kod3r/vigra,dagophil/vigra,stuarteberg/vigra,mmuellner/vigra,cbecker/vigra,martinsch/vigra,hmeine/vigra,timoMa/vigra,funkey/vigra,hmeine/vigra,psteinb/vigra,capturePointer/vigra,dstoe/vigra,stuarteberg/vigra,martinsch/vigra,cha007/vigra,dagophil/vigra,cha007/vigra,xiwei-zhang/vigra,xiwei-zhang/vigra,capturePointer/vigra,dstoe/vigra,funkey/vigra,xiwei-zhang/vigra,kod3r/vigra,dstoe/vigra,psteinb/vigra,DaveRichmond-/vigra,dstoe/vigra,timoMa/vigra,funkey/vigra,funkey/vigra,hmeine/vigra,psteinb/vigra,stuarteberg/vigra,martinsch/vigra,cbecker/vigra,dagophil/vigra,martinsch/vigra,cbecker/vigra,ThomasWalter/vigra,stuarteberg/vigra,kod3r/vigra,DaveRichmond-/vigra,kod3r/vigra,xiwei-zhang/vigra,kod3r/vigra,cha007/vigra,ThomasWalter/vigra,DaveRichmond-/vigra,dstoe/vigra,ThomasWalter/vigra,cbecker/vigra,capturePointer/vigra,cbecker/vigra,dstoe/vigra,ThomasWalter/vigra,mmuellner/vigra,timoMa/vigra,mmuellner/vigra,DaveRichmond-/vigra,dagophil/vigra,psteinb/vigra,martinsch/vigra,DaveRichmond-/vigra,capturePointer/vigra,kod3r/vigra