Merge pull request #34 from kerautret/update0.8

Update0.8
Merge pull request #35 from kerautret/update0.8

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Merge branch 'master' of github.com:kerautret/DGtalTools
Adding options to force fixed point in thinning
Merge pull request #120 from kerautret/homotopicThinning

Homotopic thinning