bin/remote.update: remove numeric names

* m0.theslinux.org -> theslinux.org
* m4.theslinux.org -> fr.theslinux.org
* m5.theslinux.org -> vn.theslinux.org
layout/default: remove numeric names

* m0.theslinux.org -> sg.theslinux.org
* m1.theslinux.org -> de.theslinux.org
* m5.theslinux.org -> vn.theslinux.org
* m4.theslinux.org -> fr.theslinux.org

Berlios support is actually removed, because the serivce is down
these days (whithout any warning/notice). Vietnam mirror is now
enabled because the network is better now