Add weighting options for scaling factor manipulation
Add options 'none', 'norm', and 'correlation', which set functions that calculate the new scaling field based on the chosen kernel(s). * 'none': Simple superposition. * 'norm': Weighted superposition. * 'correlation': Correlated sum of scaling factors. Use kernels as local correlation. This involves solving a linear equation system. The call to `set_scaling_factor` in the KnoFuInterface must now specify a weighting type.
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