This will allow you to use the feature for distributions with
installation from packages.

This looks like missing in server starterkit for me;
builder one can be installed by hand if one knows how
to do that but let's better be explicit about that.

It's strange but ve/builder and distro/live-builder
along with distro/regular-builder are all mostly
"independent", that is duplicating functionality
without any reasonable gain; spotted finally.

THE_* and friends are all unneeded for live builder image;
this commit makes dev feature basically incompatible with
install2 feature (which relies on the conventional behaviour
of main subprofile), will have to think it all over if the
combination of these two ever becomes needed.

If you make distro/live-builder.iso, the result is an image
containing almost everything (short of actual full enough
repository) to rebuild itself.  It will attempt to configure
eth0 with DHCP and reach http://ftp.altlinux.org for packages.

RAM requirements start with 2Gb, self-build is accomplished
on a 4Gb host with "make CLEAN=1 distro/live-builder.iso".

Packages required for "make distro/syslinux.iso" get included.

(some due fixups all over the place too)