fixed isnan() on Windows
fixed isnan() on Windows

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