advanced_image_processing: Created fix for NumPy failure to broadcast in merge_neuron_sets.
advanced_image_processing: Created fix for NumPy failure to broadcast in merge_neuron_sets.

nanshe-org/nanshe,nanshe-org/nanshe,jakirkham/nanshe,DudLab/nanshe,jakirkham/nanshe,DudLab/nanshe