Commencement du serveur generique

Le premier bytes donne la taille du message
probleme : concatenation des receptions
probleme : erreurs possibles sur les fonctions de String et Char
Merge branch 'reseaux' of https://github.com/GL-MPRI-2014/GL_MPRI_2014 into autoconf

Conflicts:
	src/Reseaux/Server.ml
Add network, interface, engine and clean target
fix targets
The targets network, interface and engine work
Fix dist target
Fix issue with target engine. Add target install and uninstall.
Add distcheck. Fix issue with dist.

Distcheck does not work yet. Problem with ocamlbuild.
fix target distcheck.