* scribo/core/group_info.hh,
	* scribo/core/object_groups.hh: Add merge method.

	* scribo/draw/groups_bboxes.hh: Only consider valid groups.

	* scribo/estim/components_features.hh,
	* scribo/primitive/extract/separators_nonvisible.hh,
	* scribo/subsampling/bilinear.hh,
	* scribo/text/extract_paragraphs.hh,
	* scribo/text/merging.hh: Remove debug output.

	* scribo/primitive/group/apply.hh,
	* scribo/primitive/regroup/from_single_left_link.hh,
	* scribo/primitive/regroup/from_single_left_link_wrt_h_ratio.hh:
	Fix invalid result.

	* scribo/toolchain/internal/content_in_doc_functor.hh: Remove comments.

	* scribo/toolchain/internal/text_in_picture_functor.hh: New.

	* scribo/toolchain/content_in_doc.hh,
	* scribo/toolchain/internal/text_in_doc_functor.hh,
	* scribo/toolchain/text_in_doc.hh,
	* scribo/toolchain/text_in_doc_preprocess.hh: Add verbose mode.

	* scribo/toolchain/text_in_picture.hh: Make use of the new
	functor.

	* scribo/util/component_precise_outline.hh: Fix an include.

	* scribo/src/contest/hdlac-2011/content_in_hdoc_hdlac.cc: Fix parameters.