v 0.4.0 :
- Better parse comments, to keep licence et al 
- Try to be faster than gettext C library
- Try to get GettextStub.* and GettextDummy.* be typed GettextTypes.REALIZE_TYPE ( trying to avoid
  the use of a .mli file ).
- Reread the code to improve general layout ( naming scheme, exception name... ie better style )
- Correct the BUG: related to bug from ocaml-fileutils
- Intercept problem when recoding string ( charset ), errors should be wrap inside a failsafe or
  at least raise a coherent exception.
- Create what is necessary for running into Threaded env
- Write a patch for xgettext et al
