fixed rounding of mask radius
fixed rounding of mask radius

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