* mln/value/internal/limits.hh: add support for std::numeric_limits with gcc 2.95.

	* headers.mk: add limits.hh.

	* mln/topo/complex.hh,
	* mln/topo/face.hh,
	* mln/topo/n_face.hh,
	* mln/value/builtin/floatings.hh,
	* mln/value/builtin/integers.hh: use value::internal::limits.


	* mln/util/internal/graph_base.hh,
	* mln/util/tree.hh: use <iostream> instead of <ostream>.

	* mln/core/dpoint.hh,
	* mln/core/point.hh: Help the compiler resolving 'G::dim' in method return type.

	* mln/value/float01.hh: use '&&' operator instead of 'and'.

	* tests/unit_test/Makefile.am,
	* tests/unit_test/mln_value_internal_limits.cc: Add new unit test.

git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@3089 4aad255d-cdde-0310-9447-f3009e2ae8c0