missing some comments
Adding Alpha in 3D image display
with new setFillTransparency method
Merge branch 'master' of github.com:DGtal-team/DGtal into addAlphaTextureImage
 # first basics changes

change the type of the color into unsigned char instead of unsigned int
no more implicit conversion and less place taken

change the term voxel by cube in display3D and reverberate it in Display3DFactory

change the concept point by ball that match better what is really draw, and reverberate it in Display3DFactory
 # change of names

voxel began cube
point began ball
KSSurfel began SurfelPrism

adding the lines of a voxel is now done in display3DFactory and not in addVoxel(addCube now)
 # parameters double

change of the type of parameter in function addCube and addKSCube
switch to double instead of int_64 and int
 # add a .gitignore

add a .gitignore file
and start to implement addCone and addCylinder
minor fixes around spherical accumulator
 # add cone

add the algorythm to add a pyramid from two points and a width
the pyramid will be a sum of triangles

it lacks the insertion of triangle itself
 #SetLists

changed the simple lists of Triangles, Quads and Polygons on List of List of them.

changed and/or added the associated methods
 # addCylinder and end of addCone

now theoretically operationnal, still need to debug them nevertheless
Minor edits on differential functor concepts
 # clipping pane and cmake test

move the condition of creation of a clipping plane in viewer3D it becames a condition of display

change the test in the CMakeList because when enable QGLViewer and not CAIRO a test which needed Board3DTo2D was still here. That generate a compilation error because the method init in board3DTo2D.cpp didn't exist in a project with those options
Update BasicEstimatorFromSurfelsFunctors.h
 #debogging addQuad and clipping panel

due to a misnamming of some lists some tests generated a out of range exception.
Compile ok
less restriction to open pgm3D
small doc update
 # embbeding addKSLinel
remove the structure and the method, now work only with addCone and addCylinder