Merge pull request #67 from kerautret/vol2sdp

new tool: vol2sdp
small edits file ext
Merge pull request #69 from kerautret/smallEdit3dImageViewer

small edits file ext
adding an option to display the digital surface onmly instead the whole set of voxels..
Adding  color option for each CC
Merge pull request #18 from kerautret/DisplaySurfaceIn3dImageViewer

Display surface in3d image viewer