* mln/io/all.hh: Update plot/ entries.
	* mln/io/plot/all.hh: New file including plot/ files.
	* mln/io/plot/load.hh: New draft for plot loading, nonfunctional.
	* mln/io/plot/save.hh: Update delimiter to simple whitespace.
	* mln/labeling/compute.hh: Allow accumulator array to be 
	passed as an argument.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3855 4aad255d-cdde-0310-9447-f3009e2ae8c0