Makefile: don't try to report on distclean

...and on other direct non-build actions like clean or help.
How could this stay overlooked for so long?
regular.mk: gnustep is broken on x86_64 right now

Let's only build it on i586 until gnustep packages are fixed.
{lib,conf.d}/{ve,vm}.mk: shift the real targets

lib/*.mk aren't going to be parsed for build targets
in the near future; and the early placement of those
targets was superseded by a dedicated configuration
snippet directory so just move these bits there.
main.mk: target refactoring

The issue with the original hasty code that stuck around
was that it bluntly ignored any ifdef/ifeq constructs due to
an obvious reason of being essentially a grep, not a makefile
interpreter.

It's now fixed so that e.g. arch-specific targets won't pop up
for no good reason.

Thanks ldv@ for discussion and a reminder about the dump mode
(make -p).
deflogin: argh, fix silly thinko

That \t has lurked in the source variant of the script,
was fixed in features.in/live/live/image-scripts.d/30-users once
and still has managed to creep into this fork!

Ugh.
vm.mk: add su to vm/net

It's pretty frustrating to be able to ssh into a vm
while being unable to administer it knowing the rootpw...
armh: cope with non-signed repository hashes

The '[alt]' signature reference in the stock package
doesn't fit current reality as the hash files for
Sisyphus/armh are *not* cryptographically signed.

This commit should be reverted when these are.
initial oem feature

This is an experimental and known incomplete support
for the system configuration that has to be done at the
first boot-up by its user since it's their choice.

This draft uses systemd which has been a requirement :-/
Thanks sem@ for helping out with the somewhat tricky
unit file for alterator-setup.
slinux: added ARM specific target

It's different so far even if it should be more or less merged
some day so that the packagelists become reusable across x86/ARM.
armh.mk: reworked cubox-xfce images, dropped cubox-e17

XFCE seems fine on that device while E17 has segfaulted on me so far
(specifically on Cubox and not on e.g. Nexus 7).

In a nutshell, cubox-xfce is an experiment into OEM-like flashware
while cubox-xfce-ru strives to become something more or less ready
for actual use.
slinux/arm: added youtube-dl

...as per aen@'s advice: parole can use gst0.10 specific
hardware acceleration on Cubox but Firefox doesn't, so it's
way more reasonable to download video and watch it and not some
kind of slideshow.
desktop+tde: added a few packages

kde-i18n-uk and krusader were suggested by rom_as@ back in April;
amarok was suggested by Pulfer from Rosalab after a kind review:
http://www.opennet.ru/openforum/vsluhforumID3/90521.html#158
initial net-usershares feature

This is applicable at least to XFCE and MATE based images
(plugins for the appropriate file managers are available).

NB: basically untested with installers.
armh.mk: employ net-usershares feature

It even works so far!
initial net feature

This one supports /etc/net, NM and connman; pruning the tree
to get rid of hardwired remnants is going to take some more time.
initial net-eth feature

This one is also putting an end to an overly long lived hack
named vm-net by replacing it with a bit more generic mechanism.
obsoleted vm-net feature

Hooray, this one is almost retired by now!
initial domain-client feature

Based on m-p-d's domain-client pkglist and scripts from
installer-feature-network-shares-client-stage3 package.

Many thanks to boyarsh@ for his kind help to get this working.

NB: this works on cubox but is not yet ready for installers!
armh.mk: use those new and shiny features for cubox

Some of those were long asking to be done but cubox project
managed to actually get them done at least to the extent
needed for it; so let's land those and prune things up a bit.
net, services: in Soviet Russia...

...net uses services, not services use net.  That is,
"network" is a service that needs to be enabled by the
now-existing mechanism of "services" feature, don't be
fooled by "network services" here.