add option to enforce guarantee of 2-manifold and oriented output mesh

add option to smooth frontiers of the partition

add option to smooth and mutual tessellate frontiers of the partition

add function in the class interface to optimize, after meshing, the anchor point locations to minimize a user-defined metric (two-sided L1, two-sided L2, Wasserstein distance, etc).

add simulated annealing and combined operations to reach better minima.