return types.

	* mln/util/tracked_ptr.hh
	(mln::util::tracked_ptr<T>::operator->() const)
	(mln::util::tracked_ptr<T>::operator->()):
	Remove useless `const' qualifier on return type.
	* mln/value/builtin/floatings.hh
	(mln::trait::value_<float>::min)
	(mln::trait::value_<float>::max)
	(mln::trait::value_<float>::epsilon)
	(mln::trait::value_<double>::min)
	(mln::trait::value_<double>::max)
	(mln::trait::value_<double>::epsilon):
	Likewise.


git-svn-id: https://svn.lrde.epita.fr/svn/oln/trunk@2125 4aad255d-cdde-0310-9447-f3009e2ae8c0