Warn about the maximum size to upload a file.

git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5032 ef35cc4a-2640-4bbf-98bc-65920db7d8ae
Experiments section with new plots

git-svn-id: svn://svn.forge.objectweb.org/svnroot/contrail/trunk/conpaas@5035 ef35cc4a-2640-4bbf-98bc-65920db7d8ae