With not-that-recent mkimage-profiles development,
it's no longer apparent that at least a gigabyte
of free space is required to build something useful
(at least for the tests, like syslinux.iso).

In short, the guesser cutoff margin is now 256M.

src/dst tags might have been empty confusing tags2lists;
the current implementation is more robust (along with
slightly better debug within bin/tags2lists itself).

pushd/popd spam tamed too (replaced by nice log messages).

Just in case the build.log will be inobvious, and it's easy to diagnose
automatically.  Thanks Andrey Stroganov for this use case.

Thanks for improving the initial implementation go to raorn@ for kind
commit lynch and to Yuri Bushmelev for actually suggesting something
more concise.

BTW the "1024" magic number was taken out of thin air:
the "no free space" errors are most likely to happen while
forming/populating a chroot (apt/rpm errors out) and chroots are
roughly two orders of magnitude heftier than a megabyte.

- more thorough build stages inline doc
- quieter BUILDDIR instantiation
- branding-altlinux-sisyphus by default
- prettify installer selection somewhat
- mkimage #24669 fixed upstream
- sub.in/stage1/modules: +drm (as in m-p-d, for KMS)
- tags2lists: generalize a bit

tags2lists was tweaked to work on the more natural word boundaries
than explicit "_", and the lists were renamed accordingly.

Dropped the borrowed pkglists by the way.

- syslinux: menu.c32 works
- features: initial draft
  + memtest
- mv pkg/ pkg.in/
  + server-base: include openssh-blacklist by default
- mv isodata/ copy/
- README: changed to utf8, added an URL

These feel quite interesting but not that obvious yet...

As not every package list is useful for every distro,
only the needed lists should be copied for a particular one.

- bin/tags2lists
- pkg/lists/tagged/

- s/stage2/install2/g
- added pkg/lists
- initial README (ru_RU.KOI8-R)
- mkimage topdir is in image.in/, really (off-tree build)
  + initial bin/mktmpdir
  + BUILDDIR (works)
- s/cd/iso/
- drop --with-distro (considered harmful)