Add whole brain cell detection & registration tests

tests/data/wholebrain_cell_output/cellfinder.json

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+{"signal_planes_paths": ["2"], "background_planes_path": ["4"], "output_dir": "output", "signal_ch_ids": null, "background_ch_id": null, "registration_config": "cellfinder.conf.custom", "voxel_sizes": ["5", "2.31", "2.31"], "network_voxel_sizes": [5, 1, 1], "no_detection": false, "no_classification": false, "no_register": false, "no_analyse": false, "no_figures": false, "start_plane": 0, "end_plane": -1, "save_planes": false, "outlier_keep": false, "artifact_keep": false, "max_cluster_size": 100000, "soma_diameter": 16, "ball_xy_size": 6, "ball_z_size": 15, "ball_overlap_fraction": 0.6, "log_sigma_size": 0.2, "n_sds_above_mean_thresh": 10, "soma_spread_factor": 1.4, "trained_model": "model.h5", "model_weights": null, "network_depth": "50", "batch_size": 64, "cube_width": 50, "cube_height": 50, "cube_depth": 20, "save_empty_cubes": false, "n_free_cpus": 8, "max_ram": null, "save_csv": false, "debug": false, "sort_input_file": false, "no_models": false, "model": "resnet50_tv", "heatmap_smooth": 100, "mask_figures": true, "install_path": ".cellfinder", "download_path": "tmp", "no_amend_config": false, "atlas": "allen_mouse_100um", "orientation": "prs", "backend": "niftyreg", "affine_n_steps": 6, "affine_use_n_steps": 5, "freeform_n_steps": 6, "freeform_use_n_steps": 4, "bending_energy_weight": 0.95, "grid_spacing": -10, "smoothing_sigma_reference": -1.0, "smoothing_sigma_floating": -1.0, "histogram_n_bins_floating": 128, "histogram_n_bins_reference": 128, "paths": {"output_dir": "output_dir", "registration_output_folder": "output_dir/brainreg_output", "metadata_path": "output/cellfinder.json", "registration_metadata_path": "output_dir/brainreg_output/brainreg.json"}}