* mln/value/int_u.hh: Replace argument type by (unsigned int)
	when it was (int).
	(value_integer_::max()) : Replace card - 1 by mln_max(enc_) to avoid
	returning -1 for high quantized values.

	* tests/io/ppm/ppm16.cc,
	* tests/io/ppm/ppm23.cc: Update the path of the input image.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@1543 4aad255d-cdde-0310-9447-f3009e2ae8c0