More patches for bird

Hello Here are some more patches for bird: 4-as4_option.diff - Add per-bgp_instance option to disable as4 support. 5-add_doc.diff - Update of documentation. 6-fix-lpref.diff - Fix LOCAL_PREF handling. - Isn't 'default bgp_local_pref' configuration option useless? Every route has some LOCAL_PREF attribute. 7-fix-med.diff - Fix MED handling. This patch also changes default value for 'default bgp_local_pref' configuration option according to RFC 4271. -- Elen sila lumenn' omentielvo Ondrej 'SanTiago' Zajicek (email: santiago@crfreenet.org) OpenPGP encrypted e-mails preferred (KeyID 0x11DEADC3, wwwkeys.pgp.net) "To err is human -- to blame it on a computer is even more so."