* mln/opt/element.hh: New, define opt::element and opt::nelements.
	* mln/debug/println_with_border.spe.hh,
	* mln/debug/println_with_border.hh,
	* mln/data/paste.spe.hh,
	* mln/data/fill_with_value.spe.hh,
	* mln/data/fill_with_image.spe.hh,
	* mln/data/memcpy_.hh,
	* mln/data/memset_.hh,
	* mln/border/fill.hh,
	* mln/border/duplicate.hh,
	* mln/border/mirror.hh,
	* tests/opt/value.cc,
	* tests/border/duplicate_full.cc,
	* tests/border/mirror_full.cc,
	* tests/border/fill_full.cc,
	* tests/border/duplicate.cc,
	* tests/border/mirror.cc,
	* tests/border/fill.cc: Use now opt::element and opt::nelements.
	* mln/opt/value.hh: Update Copyright.
	* tests/opt/element.cc: New tests.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3179 4aad255d-cdde-0310-9447-f3009e2ae8c0