Changes of the day so far:

  - Plug a whole bunch of memleaks
  - each process now have to call gras_{init,exit}. One day, their log
    settings will be separated
 [Transport]
  - Continue the code factorisation between SG, RL and common

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/simgrid/simgrid/trunk@179 48e7efb5-ca39-0410-a469-dd3cf9ba447f