ftp : use send and recev

[DevRaph]

make test with this two not with two read on socket
steps

1. while read 0 in client
2. send msg of "position commandes"
3. receive in serveur
4. split msg receive !!! special split (gestion of " ") >> if " -> error
5. parse in position client/serveur when cmd (or env), cmd, option (-), params (= or other) << structure for commande
6. if ; create other struct commande (list)
7. builtin
8. execv by fork or functions
9. free each part of list