* doc/Doxyfile.in: Cleanup doxygen output.

	* doc/groups.dox: Set groups.

	* scribo/binarization/global_threshold.hh,
	* scribo/binarization/internal/niblack_formula.hh,
	* scribo/binarization/internal/sauvola_formula.hh,
	* scribo/binarization/local_threshold.hh,
	* scribo/binarization/niblack.hh,
	* scribo/binarization/niblack_threshold.hh,
	* scribo/binarization/otsu.hh,
	* scribo/binarization/otsu_threshold.hh,
	* scribo/binarization/sauvola.hh,
	* scribo/binarization/sauvola_ms.hh,
	* scribo/binarization/sauvola_ms_split.hh,
	* scribo/binarization/sauvola_threshold.hh,
	* scribo/core/erase_objects.hh,
	* scribo/debug/alignment_decision_image.hh,
	* scribo/debug/bboxes_enlarged_image.hh,
	* scribo/debug/bboxes_image.hh,
	* scribo/debug/char_space_image.hh,
	* scribo/debug/decision_image.hh,
	* scribo/debug/highlight_text_area.hh,
	* scribo/debug/line_info_image.hh,
	* scribo/debug/linked_bboxes_image.hh,
	* scribo/debug/links_decision_image.hh,
	* scribo/debug/links_image.hh,
	* scribo/debug/logger.hh,
	* scribo/debug/looks_like_a_text_line_image.hh,
	* scribo/debug/mean_and_base_lines_image.hh,
	* scribo/debug/save_comp_diff.hh,
	* scribo/debug/save_label_image.hh,
	* scribo/debug/save_table_image.hh,
	* scribo/debug/text_areas_image.hh,
	* scribo/debug/text_color_image.hh,
	* scribo/draw/bounding_box_links.hh,
	* scribo/filter/images_in_paragraph.hh,
	* scribo/filter/line_links_x_height.hh,
	* scribo/filter/object_groups_mean_width.hh,
	* scribo/filter/object_groups_size_ratio.hh,
	* scribo/filter/object_groups_small.hh,
	* scribo/filter/object_groups_with_holes.hh,
	* scribo/filter/object_links_aligned.hh,
	* scribo/filter/object_links_bbox_h_ratio.hh,
	* scribo/filter/object_links_bbox_overlap.hh,
	* scribo/filter/object_links_bbox_ratio.hh,
	* scribo/filter/object_links_bbox_w_ratio.hh,
	* scribo/filter/object_links_bottom_aligned.hh,
	* scribo/filter/object_links_center_aligned.hh,
	* scribo/filter/object_links_left_aligned.hh,
	* scribo/filter/object_links_non_aligned_simple.hh,
	* scribo/filter/object_links_right_aligned.hh,
	* scribo/filter/object_links_top_aligned.hh,
	* scribo/filter/objects_h_thick.hh,
	* scribo/filter/objects_h_thin.hh,
	* scribo/filter/objects_large.hh,
	* scribo/filter/objects_on_border.hh,
	* scribo/filter/objects_size_ratio.hh,
	* scribo/filter/objects_small.hh,
	* scribo/filter/objects_thick.hh,
	* scribo/filter/objects_thin.hh,
	* scribo/filter/objects_v_thick.hh,
	* scribo/filter/objects_v_thin.hh,
	* scribo/filter/objects_with_holes.hh,
	* scribo/filter/paragraphs_bbox_overlap.hh,
	* scribo/filter/paragraphs_in_borders.hh,
	* scribo/filter/paragraphs_in_image.hh,
	* scribo/filter/separators_in_borders.hh,
	* scribo/filter/separators_in_element.hh,
	* scribo/filter/separators_in_paragraph.hh,
	* scribo/filter/separators_vert_in_borders.hh,
	* scribo/fun/v2b/objects_on_border_filter.hh,
	* scribo/postprocessing/images_to_drop_capital.hh,
	* scribo/preprocessing/denoise.hh,
	* scribo/preprocessing/denoise_bg.hh,
	* scribo/preprocessing/denoise_fg.hh,
	* scribo/preprocessing/deskew_crop.hh,
	* scribo/preprocessing/homogeneous_contrast.hh,
	* scribo/preprocessing/split_bg_fg.hh,
	* scribo/primitive/extract/alignments.hh,
	* scribo/primitive/extract/cells.hh,
	* scribo/primitive/extract/components.hh,
	* scribo/primitive/extract/lines_h_single.hh,
	* scribo/primitive/extract/lines_h_thick_and_single.hh,
	* scribo/primitive/extract/lines_v_pattern.hh,
	* scribo/primitive/extract/lines_v_single.hh,
	* scribo/primitive/extract/lines_v_thick_and_single.hh,
	* scribo/primitive/group/from_double_link.hh,
	* scribo/primitive/identify.hh,
	* scribo/primitive/link/compute.hh,
	* scribo/primitive/link/with_single_left_link.hh,
	* scribo/primitive/link/with_single_left_link_dmax_ratio_aligned.hh,
	* scribo/primitive/link/with_single_right_link.hh,
	* scribo/primitive/link/with_single_right_link_bottom.hh,
	* scribo/primitive/link/with_single_right_link_dmax_ratio_aligned.hh,
	* scribo/primitive/link/with_single_right_link_top.hh,
	* scribo/table/align_lines_horizontaly.hh,
	* scribo/table/rebuild.hh,
	* scribo/text/extract_lines.hh,
	* scribo/text/extract_lines_wo_merge.hh,
	* scribo/text/recognition.hh,
	* scribo/toolchain/content_in_doc.hh,
	* scribo/toolchain/content_in_hdoc.hh,
	* scribo/toolchain/internal/content_in_doc_functor.hh,
	* scribo/toolchain/internal/content_in_hdoc_functor.hh,
	* scribo/toolchain/internal/text_in_doc_functor.hh,
	* scribo/toolchain/internal/text_in_doc_preprocess_functor.hh,
	* scribo/toolchain/internal/text_in_picture_functor.hh,
	* scribo/toolchain/internal/toolchain_functor.hh,
	* scribo/toolchain/nepomuk/text_extraction.hh,
	* scribo/toolchain/text_in_doc.hh,
	* scribo/toolchain/text_in_doc_preprocess.hh,
	* scribo/toolchain/text_in_picture.hh: Fix comments.