Improve kernel generation for Sobel operator#600

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meshtag wants to merge 3 commits intoboostorg:developfrom

meshtag:feature/Sobel_Kernel

Commits on Apr 21, 2021

Added all standard morphological transformations
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Commits on Apr 22, 2021

Merge branch 'develop' of https://github.com/boostorg/gil into feature/Sobel_kernel_generation
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Commits on Apr 29, 2021

Improve kernel generation for Sobel operator
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