Updated Netif to reflect the changes in Net.Manager.
Cosmetics.
Updated Io_page, Netif, improved page_stubs.c.
Cometics: deleted whitespaces and tabs.
Io_page.pages now allocate n block of one pages instead of allocating one block of n pages and slitting it.
Console.log_s now returns unit, adapted Netif to those changes as well as gntref being now an int.
Updated CHANGES.