CO-CODE Hugo-Luke

+ last_exit_status set/get functions for here_doc
+ TODO : replace all occurences of last_exit_status
+ **environ fix
+ builtin_unset() fix

Makefile

@@ -36,6 +36,7 @@ SRCS =	main.c init.c free.c generic.c \
 		redirections.c here_doc.c \
 		exec_cmd_line.c pipeline.c \
 		find_access.c subshell_exec.c subshell_wait.c simple_cmd_builtin.c \
+		last_exit_status.c \
 		cd.c pwd.c export.c unset.c exit.c env.c echo.c
 
 DIR_OBJS = builds