improved bundleit,
 - fixed mandatory sound check and import, now added a token mandatory_sound_dir in the menu
   file for that.
 - now manage activities with external resources (uncomplete, the runit.sh file is not adapted for
   having changing places for resources.
 - now manage activities with external plugins (not python)

Now acivities that does point to an other activity resources must not have the
resources directory.


svn path=/branches/gcomprixo/; revision=3021