[dmritool-discussion] Some codes on sampling scheme design are released

[Jian Cheng]

Hi,

I have committed some codes on sampling scheme design.

* Mixed Integer Linear Programming (MILP) for sampling scheme design is
released in matlab. See folder "Matlab".
* Iterative Maximum Overlap Construction (IMOC) for sampling scheme
design is released in C++. See command "SamplingSchemeQSpaceIMOCEstimation".
* Add a tutorial on sampling scheme design with some demos. See
https://diffusionmritool.github.io/tutorial_qspacesampling.html  To run
these demos in matlab, you do not need to build dmritool.

Other commits:
* Use some scripts to generate the c++ executable list, matlab function
list, run demos in tutorials, update dmritool website and doxygen.
* Add "VTKPolyData.py" to visualize vtk files and save the visualization
into png files. It is modified based on the one in ITKExamples. It can
replace "vtkviewer", and it does not need to build the c++ codes.

best,
Jian Cheng