when using doubles, %lg should be used for scanf and %g for printf (which is

weird because it means printf does not make any difference between float and
double). However %lg also works for printf. So let's keep it uniform and
we'll change that if we ever find a machine where it does not work.

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@639 48e7efb5-ca39-0410-a469-dd3cf9ba447f