changes for new pipeline::Wrap<T>
introduced gap between images of an image stack
Merge branch 'master' of github.com:funkey/imageprocessing

Conflicts:
	gui/ImageStackView.cpp
got rid of warnings
added ComponentTreePruner to reduce the height of a component tree
improved ImageStackDirectoryWriter: creates directory on demand
made ImageStackDirectoryWriter save in tiffs with float
made ImagePainter more intelligent: if values exceed 1.0, it colors such that neighboring values have different hue
Merge branch 'master' of github.com:funkey/imageprocessing
small fix for hue value in ImagePainter
added hover annotations for image stacks
Merge remote-tracking branch 'funkey/master' into catmaid

Conflicts:
	io/ImageReader.cpp