test_advanced_image_processing: Added tests for preprocess_data that use 3D data.
test_advanced_image_processing: Added a test for generate_dictionary on 3D data.
test_advanced_image_processing: Added a test for generate_local_maxima_vigra using 3D data.
test_advanced_image_processing: Added a test for test_generate_local_maxima_scikit_image_2 using 3D data.
test_advanced_image_processing: Added a test for generate_local_maxima using 3D data.
test_advanced_image_processing: Added test for extended_region_local_maxima_properties using 3D data.
test_advanced_image_processing: Added tests for remove_low_intensity_local_maxima using 3D data.
test_advanced_image_processing: Added tests for remove_too_close_local_maxima using 3D data.
tests/test_advanced_image_processing.py: Added a variant of test_wavelet_denoising, which is a bit more general.
tests/test_advanced_image_processing.py: Added a test for the 3D case of wavelet_denoising.