Use faster implementation of binary dilation using FFT #1638
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Binary dilation is very slow, especially for large footprints. This PR adds a faster implementation using fast Fourier transforms (FFTs) that gives identical results to scipy's
binary_dilation. Based on the following paper: "Dilation and Erosion of Gray Images with Spherical Masks", J. Kukal, D. Majerova, A. Prochazka (Jan 2007).