The OS scripts currently run with the whole noded environment; this is
different from the hooks which run with a cleared one and most likely
an oversight.

This _might_ create problems when upgrading, so it needs to be clearly
announced for the new version.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

This removes:

- the check in backend that such OSes have a variants file or if it
  exists that is non-empty; in order for this to work, we also rework
  the logic in backend._TryOSFromDisk to allow for optional OS files
- the check in cluster verify such OSes to have a non-empty variant
  list (the check for consistent variants is still kept)

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

In order to make the display right on 80-columns terminals.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Guido Trotter <ultrotter@google.com>

Signed-off-by: Stephen Shirley <diamond@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

No rewrapping is done in this patch, just updates to the settings.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

Also replace one UTF-8 char with the ASCII equivalent, not all Pandoc
versions support it.

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: Michael Hanselmann <hansmi@google.com>

Signed-off-by: Iustin Pop <iustin@google.com>
Reviewed-by: René Nussbaumer <rn@google.com>