added tests for image.rowBegin() and image.columnBegin()
added tests for image.rowBegin() and image.columnBegin()

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