server: generalize server-ovz configuration bits

OpenVZ related part is now a reusable use/server/ovz target,
and service related groups which have been largely taken from
rider@'s server-light project are now use/server/groups/base.
regular.mk, p7.mk: added server-ovz

This image is largely a rebase of server-ovz.iso onto regular-server;
it's not feasible to provide a single image that would install either
"mini" server or openvz/kvm one based on user choice during boot alas
(even if both ovz-el and std-def kernels are provided within "ovz" ISO
and vzctl&co could be stuffed into a package list/group).

Maybe this is fixed some day...
regular.mk: deduplicate use/install2/fs

We want every regular installer to know more than ext4 apparently.
regular.mk: initial regular-jeos

This is a minimalistic ALT-based system installer tailored
for those who know how to bring up networking and apt-get
the packages they actually need; thanks frbrgeorge@ for
proposing the specification as well as sem@ and glebfm@
for discussion.

No mc, no glibc-locales, even no man and interactivesystem!
Packages included: apt basesystem openssh vim-console

PS: Sisyphus-based regular build is not the main goal though
thus the p7/branch {bri,klu}dge.
p7.mk: tweak VE template cache name

Renamed ve/altlinux-p7 to ve/altlinux-p7-ovz-generic for clarity.
desktop+gnustep: wholesale facelift

This has been prepared by real@ and kostyalamer,
thanks them both; still needs more QA though.
vm.mk: vm/net should use/repo

IOW one has every right to expect that package manager
is set up already in a networked virtual machine.
p7.mk: added vm/net alias

vm/altlinux-p7-vm-net is yet another bridge...
vm.mk: use sysvinit

I don't see any reason to use systemd within VM images,
and it would stick its journal as a syslog implementation
when not ditched explicitly :-/
regular.mk: several more packages added to sysv-tde

These have been requested by Speccyfighter:
http://lists.altlinux.org/pipermail/community/2014-February/681710.html
regular.mk: add gfxboot to icewm :(

It's been gfxboot-free but no user visible facility to select locale
has emerged through these years; it's been decided to put gfxboot
until some text chooser is available (thanks aen@ for discussion).
regular.mk: extend virtual guest support in jeos

KVM and VirtualBox support packages are pretty tiny
but essential when these images get deployed within
virtual environments for any reason, let's add 'em.
tar2fs: append to MODULES_PRELOAD, do not clobber

Thanks glebfm@ for spotting that it's = instead of +=
as it goes in all the other places; I remember no good
reason to overwrite the potentially preexisting contents.
desktop+gnustep: app status update

Split development packages into dev+gnustep pkglist -- these are
worth including in "full" version but will need thorough testing
so as to present the tools to those who value these.

Some of user packages are problematic and shouldn't be included
right now; the problems are mostly of these kinds:

- app won't start (at all or effectively);
- useless for being too alpha quality/incomplete;
- menu file for a commandline app lacking any feedback;
- package lacks the dependencies needed;
- it's a LoginPanel ;-)

Thanks a lot to upstream authors, real@ the packager
and kostyalamer who prepared a lot of menufiles anyways!
1.1.25-alt1

- regular updates
gear-store-tags