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This reverts commit 01c88c1b.

Refs: #8263

Since then, we've bumped the memory requirements (both in our
documentation and on the test suite's "hardware") to 2 GB, so the
original reason for this change has gone away => let's go back to
a value that was tested and confirmed to work (as in: allow upgrading
a running Tails) on Wheezy, instead of a value that was tested on
Jessie, but only for checking for available upgrades.

The follow-ups will be:

 * the cool ideas posted on
   https://labs.riseup.net/code/issues/8263#note-1 will become a new,
   dedicated ticket (that has no reason to block the Tails 2.0 release);

 * #8083 and #7986 will tell us if the value this commit reverts to
   is OK.

Will-fix: #7966

Note that I did not touch historical pages.

Refs: #10531

Refs: #10531

Will-fix: #10533

Refs: #8561

Will be part of the "Installation Assistant" (not written yet).

It will have the new instructions for full upgrade in a bit.
So let's do that now.

It will have CSS and JS once we release the ISO verification extension.
So let's do that now.

Conflicts:
	wiki/src/install/mac/clone.mdwn

... and move tails-wait-until-tor-has-bootstrapped.service from
default.target to it. The main effect is that anything that wants to
start after graphical.target or multi-user.target does not have to wait
for Tor to have bootstrapped (which could very well never happen, e.g.
when working offline) anymore.

Will-fix: #9393

When waiting for specific notifications we'll completely depend on
robust_notification_wait() from now on *and* it will leave other
notifications unlike the old version.

Will-fix: #8782

In Jessie, org.gnome.gnome-screenshot.auto-save-directory is empty
since the default is sensible, ~/Pictures. To save the removed
scenario we'd have to set it explicitly, which seems stupid. Besides,
the 'A screenshot is taken when the PRINTSCREEN key is pressed'
scenario is already testing that GNOME Screenshot saves into this
directory, which is enough.

Tor 0.2.7.x packaging now uses a template systemd unit file,
and the instance we use is called tor@default.service.

This ensures that "services where correct time is essential should be
ordered after this unit" (as long as such services have themselves
declared the right dependencies). We don't ship any such services
currently, so this is rather pedantic a commit.

Note: in our case, we don't want the Tor service to wait for
time-sync.target, since we still use the Tor consensus for time
sync' purposes.

I want to use time-sync.target (see systemd.special(7)), so that we can
order stuff after it.

But with Type=simple, we can't tell when htpdate is done, so we can't
specify that time-sync.target has not been reached until then. So let's
use Type=oneshot. But then, 20-time.sh would block until htpdate is
done, which is not what we want; this is solved by using --no-block when
restarting the service there.

The extre 'install.*' is really needed to not scrub translated pages.

The previous version was disabling htmlscrubber on all pages except an
nonexistent page (as PageSpace doesn't treat '/').

Despite popular believes "install/*" is enough to specify install and
any level of pages below it. See http://ikiwiki.info/ikiwiki/pagespec/.

PageSpec behave weirdly with page names with numerous '.', translatable
pages ($page.*) are fine but not translatable inlines ($page.inline.*).

Tests done as part of #8260 have shown that when exactly memlockd is
stopped does not really matter in practice.

We're merging the current state of web/assistant in order to test some
parts of it live, especially the new download page.

The 0.2.7.x packages for Jessie have everything we want,
no need to build our own anymore.

Closes: #10520