* olena/oln/morpho/Rd/union_find.hh: Update.
	* milena/test/main.cc: Use Rd.
	* milena/morpho/Rd.hh: New.
	* milena/level/fill.hh: Add assertions.
	* milena/level/compare.hh: New.
	* milena/level/paste.hh: New.
	* milena/core/macros.hh (mln_ch_value): New.
	* milena/core/concept/image.hh: Update.
	* milena/core/image2d.hh: Update.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@987 4aad255d-cdde-0310-9447-f3009e2ae8c0