[Julia set] SIC algorithm (c=0.5+0.25i)

Black & White Smooth Iteration Count Algorithm (SICA) ; see formula after
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Smooth iteration count : u(z₀)=n+1+log_d{ln(M)/ln|z_n|} where n is the number of iterations, M the maximum radius bound, and d the degree of equation : z_n+1=az_n^d+Q(z_n) where deg(Q)≤d-1