deactivated Toggle3DRendering for all non-4d shapes, as the volumerenderer can't deal with it
Merge branch 'master' of github.com:ilastik/ilastik
Merge branch 'master' of github.com:ilastik/ilastik
Merge branch 'master' of github.com:ilastik/ilastik
fix issue 97: use new OpMaxChannelIndicatorOperator
Merge branch 'master' of github.com:ilastik/ilastik