* Use library init/fini functions for our initialization.
- you can use logs and other feature as soon as you want in your
code (even before the xbt_init / MSG_init)
- - xbt_exit is now a no-op.
+ - xbt_exit is now a no-op and produce a warning when used.
-- Da SimGrid team <simgrid-devel@lists.gforge.inria.fr>