minor fixes

qim3d/__init__.py

qim3d/detection/_common_detection_methods.py

qim3d/filters/_common_filter_methods.py

qim3d/generate/_aggregators.py

qim3d/mesh/_common_mesh_methods.py

qim3d/ml/models/_unet.py

qim3d/operations/_common_operations_methods.py

qim3d/processing/_layers.py

qim3d/processing/_local_thickness.py

qim3d/processing/_structure_tensor.py

qim3d/viz/_cc.py

qim3d/viz/_data_exploration.py

qim3d/viz/_detection.py

qim3d/viz/_k3d.py

qim3d/viz/_structure_tensor.py

qim3d/viz/colormaps/_segmentation.py

qim3d/viz/itk_vtk_viewer/run.py