added: - exception handling if group has already been created - unlink dataset in file (i.e. allow to overwrite it) if dataset already exists
added:
- exception handling if group has already been created
- unlink dataset in file (i.e. allow to overwrite it) if dataset already exists

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