rescue+x11: added extract

The libextractor utility; doesn't require libX11
but does requrie libgstreamer1.0 which is too much
for the plaintext image either.
QUICKSTART: added howto reference

It's actually worth working into the offline docs probably
but it appears that overlooking this howto's existence is
easier than I thought; thanks manowar@ for pointing this out.
dev: added support for squashfs-tools 4.3

New mksquashfs requires /proc; mkimage 0.2.15 takes care for that;
it's time for this feature to get accustomed either.
dev: tweak hasher script hook order

This should have been done back when live feature
has been ported to use deflogin feature indeed :-/
regular.mk: added gparted

Suggested by frbrgeorge@ and sounds quite reasonable
given that live-rescue.iso is very immature yet and
there are only a few -- but compelling -- reasons
to provide a graphical rescue image, gparted being
one of them for sure.
1.1.38-alt1

- mksquashfs 4.3 support
gear-store-tags