changed constructor with default argument into a pair of constructors (MSVC bug)
changed constructor with default argument into a pair of constructors (MSVC bug)

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