We don't have proper manpages for lb_*_* commands yet,
rather than having a useless stub for it that's just a
boilerplate and nothing more, let's remove them for now,
and add them back one by one but with full reference content.

Updating lb config --config manpage option to reflect that any Git Id can be specified, not just branches.

Removing chroot_local-patches, too much overhead for just applying patches (notably, with -p1 enforced), hooks are more flexible anyway.

Dropping global package-lists entirely, only local package lists within the config tree are support.

Dropping global binary includes and moving binary local-includes to includes, just as with chroot includes and local-includes.

Cleaning http_proxy and ftp_proxy settings in chroot, people using apt proxies set them throught the apt pseudo-proxy options, and people using real proxies use config/environment.{chroot,binary} to set them.

Adding --system option to define the resulting image type to be a live system or a normal, non-live system.