* tests/fast_median.cc: New test.
	* tests/pixter_point2d.cc: Update test.
	* mln/core/pixel.hh: Add typedefs in the class pixel_.
	* mln/core/macros.hh: Add new macros.
	* mln/core/concept/pixel_iterator.hh: New, rename Fast_Iterator concep as Pixel Iterator.
	* mln/core/concept/fast_iterator.hh: Remove.
	* mln/core/concept/genpixel.hh: Constructor fixed.
	* mln/core/pixter2d_b.hh: Broken!.
	* mln/core/image2d_b.hh: Add new method point_at_offset.
	* mln/core/dpoints_pixter.hh: Adapt dpoint_pixter to the new hierarchy.
	* mln/core/internal/pixel_iterator_base.hh: New, rename fast_iterator_base_ as pixel_iterator_base_.
	* mln/core/internal/fast_iterator_base.hh: Remove.
	* mln/level/fast_median.hh: New median using qixter.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@1022 4aad255d-cdde-0310-9447-f3009e2ae8c0