improve the level set method, C_V evolutionary model. For the multi-phase

multiphase_improved
...................\backward_gradient.m
...................\CURVATURE_CV.m
...................\Delta.m
...................\Demo_multiphase_improved.m
...................\Demo_multiphase_original.m
...................\EVOLUTION_4PHASE.m
...................\EVOLUTION_4PHASE_DR.asv
...................\EVOLUTION_4PHASE_DR.m
...................\forward_gradient.m

...................\get_contour.m
...................\Heaviside.m
...................\initial_sdf2circle.m
...................\plotLevelSet.m
...................\quadrifit.m

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