ENH: Add ITK_Example_RegistrationWithCorrespondingPointsInMemory.ipynb

[N-Dekker]

Demonstrates how to help an image registration by using a fixed and a moving set of corresponding points in memory (without file I/O).

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[thewtex]

Line #22.    # Converts an itk.Point to a tuple.

We probably want to use pointset_from_dict and itk.dict_from_pointset -- these provide simple, efficient, familiar interfaces for folks who are used to working with NumPy arrays.

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[N-Dekker]

Thanks Matt, maybe the use of pointset_from_dict/dict_from_pointset could be added as a follow-up.

By the way, I found Python's tuple more convenient than itk.Point, especially when creating a point "manually":

# Just works
my_point = (x, y)

# Causes errors
my_point = itk.Point[itk.D, 2](x, y)

itk.Point[itk.D, 2](x, y) caused the following errors:

TypeError: new_itkPointD2 expected at most 1 arguments, got 2
Additional information:
Wrong number or type of arguments for overloaded function 'new_itkPointD2'.
  Possible C/C++ prototypes are:
    itkPointD2::itkPointD2()
    itkPointD2::itkPointD2(double const *)
    itkPointD2::itkPointD2(double const &)
    itkPointD2::itkPointD2(std::array< double,2 > const &)
    itkPointD2::itkPointD2(itkPointD2 const &)

An extra pair of parentheses works, but it isn't particularly elegant, right?

# Extra pair of parentheses, Works!
my_point = itk.Point[itk.D, 2]((10.0, 15.0))

Is there a more convenient way to create an itk.Point? Something like itk.make_point(x, y) ???

[thewtex]

Line #60.        ax.imshow(cmap="binary_r", origin="lower", X=itk.GetArrayViewFromImage(image))

itk.array_view_from_image is preferred over itk.GetArrayViewFromImage for style.

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[N-Dekker]

Thanks! Should we eventually deprecate itk.GetArrayViewFromImage in favor of itk.array_view_from_image ?

Anyway, addressed by this force-push, please check!

[thewtex]

Very nice, Neils! A few style-related comments inline.