* src/Makefile.am: compile new examples.

	* filter/large_objects.hh: fix use of accu::math::count.

	* src/extract/primitive/extract_discontinued_hlines.cc,
	* src/extract/primitive/extract_discontinued_lines.cc,
	* src/extract/primitive/extract_discontinued_vlines.cc,
	* src/extract/primitive/extract_thick_hlines.cc,
	* src/extract/primitive/extract_thick_vlines.cc,
	* src/extract/primitive/find_discontinued_lines.cc,
	* src/extract_text_double_several_links.cc,
	* src/extract_text_several_graph.cc,
	* src/extract_text_several_left_links.cc,
	* src/filter/large_objects.cc,
	* src/filter/small_objects.cc,
	* src/filter/thick_objects.cc,
	* src/filter/thin_objects.cc,
	* src/morpho.cc,
	* src/rectangularity.cc,
	* src/thin_bboxes.cc:
	  - Do not use essential/2d.hh
	  - Specify the namespace of the usage() routine.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@4118 4aad255d-cdde-0310-9447-f3009e2ae8c0