live-builder: added qemu-user-binfmt_misc

This provides the means to cross-build at least ARM chroots,
there are known problems with PowerPC for me so far:
http://lists.altlinux.org/pipermail/devel/2012-July/194855.html

See also http://www.altlinux.org/Ports/arm/chroot for /proc magic.
syslinux: no ui, no escape

This one was suggested by enp@ for industrial use where
some extra protection for the boot process might be quite
desirable.

If no syslinux ui was specified (the stock configuration paths
ensure there is one) or if it was set to "none" explicitly,
then there's no boot: prompt (let alone any menu).

If there's a need to ensure that the boot process is not
interruptable by Ctrl/Shift/Caps Lock/Scroll Lock.
conf.d/test.mk: experimental stuff went here

Some images were unbuildable (at least without special setup,
like ve/centos), unusable or just not useful in any meaningful way
(like distro/live-isomd5sum); as these tend to get any attention
during experiments, I decided to put them together in a separate
configuration file that would be effectively skipped if DEBUG
is not requested.
live-builder.iso += livecd-qemu-arch

The package actually passed the test and just got uploaded
to Sisyphus proper; its aim is to help set up the cross-arch
QEMU build environment.

NB: there are known issues with PPC32-on-x86_64 (which were
the cause for this package and commit to be created in the
first place).
syslinux: honour META_VOL_SET for boot menu

This trots along the TODO item on text branding
and hopefully helps Michael Radyuk (torabora)
with his feature request to tweak the installer's
"Install ALT Linux" label; as an example, Simply
will now offer to "Install Simply Linux".
image.in/Makefile: support image STATUS

Another feature suggested by Michael Radyuk (torabora):
some images are known alpha/beta quality, it's more handy
to just state this at the build time than to rename by hand.
0.7.6-alt1

- minor improvements
gear-store-tags
lists/tagged/rescue*: minor update

Several GPT-related packages added along with
a few more rescue related ones.
rescue += openssh

Found myself pretty silly while sittin' at the rescue console
and bein' unable to leave the cool server room for a way
more comfortable armchair and a laptop's keyboard...

(yes, it was that disk array needing GPT tools)
rescue += boot off sda/sdb

There's no (convenient) "eject" at times, so it's better to provide
extra ways of booting right away.
rescue += zerofree, wipefreespace

This kind of tools can be badly missing at times.
git usage refactoring

There were heaps of "if type -t git" there already;
it wasn't an unintentional mishap but rather a moderate
copy-paste to get the use cases, and now these seem to
have essentially settled.

So time to scrap some dups.

NB: the scripts in the generated profile can't rely on
the contents of the metaprofile (these need to be able
to work in standalone case either), so a bit of crap
still lurks there.
razorqt += qps

Don't remember who exactly recommended this nice and elegant
system monitor but it fits just fine.
features: drop dirtags

Finishes what 3dd020338b10eb79838afb4905505020688ca05a
has essentially done... the path seems to be elsewhere.
complex subprofile delimiter changed ("/" -> "@")

That sub/stage2/install2 was somewhat clumsy actually as it looked
like a hierarchical thing while being a substitution thing:
generic stage2 would get put in place renamed as install2.

This could only get worse with hierarchical features which have
already been both requested and considered for quite a time,
and "stage2 at install2" reads much more naturally.
features: hopefully better README

Thanks both drool@ for his mild frustration with the current
documentation as well as Greg Kroah-Hartman, Heikki Orsila
and Neil Brown for http://lwn.net/Articles/504814/ -- the docs
should really emphasize *why* something is done, not *how*,
as the "how" part is better documented with the code itself
(that doesn't mean that "the big picture" isn't needed).
doc/qemu.txt: mostly automated

This part of docs was pleading to put it into a small shell
script; it was done to facilitate kas@' debugging efforts
so that qemu-system-ppc might eventually get fixed, thus
livecd-qemu-arch package now "obsoletes" this file.
minor documentation facelift

A few more items were asking for some attention.

In particular, build examples should start with
the most basic, error-proof and quick targets.
merged experimental support for opensuse

This isn't ready for general consumption (just as centos one)
but the notion of REPO is floating around along with apt-conf
thoughts, and it might still be useful to someone poking around
conf.d/test.mk.

Request hasher-pkg-init.spec from mike@ or led@ if interested;
the experiments were carried out using openSUSE 11.4 repository
and slightly patched hasher (cpio blacklist for devices).