Add image extractor functor 3D -> 3D from ref points
tmp..
Merge branch 'master' of github.com:DGtal-team/DGtal into 2DImageExtractor
completing doc for functor Point2DEmbedderIn3D
doc and other constructor
changelog
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example edits with second constructor
Merge pull request #718 from kerautret/2DImageExtractor

2d image extractor functor