Don't try to scrub data unless the used guestfs appliance supports
it

Works better this way in OpenSUSE

python-dialog package in OpenSUSE decorated the returned enabled
choices from a dialog checklist with `"'. Remove those characters

In the documentation and the printed messages, remove all references
to ~okeanos, pithos or cyclades.

 * Move all common WizardPage variables to the base class
 * Give more sensible names to some variables
 * Make Wizard compute the title for all WizardPages

Make the cloud selection wizard page an instance of WizardMenuPage

Make the ChangeLog comply with the latest changes

When registring an image, use the information returned by the
kamaki register method to construct the metadata file.

When dumping the image to the local filesystem, store the image
properties and the disk-format info in the metadata file.

This options can be used to get the authentication URL and token
from a saved cloud section in the kamaki configuration file

 * Change the authentication everywhere to use clouds
   (authentication URL and token pairs)
 * Add menu entries to manage clouds
 * Add an extra -a option in snf-image-creator to allow the user to
   specify authentication URLs

 * Prefix all private methods with _
 * Write missing docstrings
 * Move all public methods above the private ones
 * Add module docstrings where missing
 * Define source code encodings on all modules

For windows images check the appropriate registry keys to find out
the system users

If the image gets registered as public allow anyone to read the
metadata and the md5sum file.

Before uploading to pithos, check if any remote file gets
overwritten.

Check if /var/spool/mail exists before trying to remove the content
of the directory.

Syspreps that have already been executed shouldn't get returned by
list_syspreps

If libguestfs's inspect_get_distro returns "unknown", then use the
OSFAMILY image property value as OS value.