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 * Rename the image property INSTALL_DEFAULT_UNATTEND to
   IGNORE_UNATTEND.
 * Add documentation about this property

ModularBackend introduced a class attribute that denotes
the class version. Since class version 1, ModularBackend
supports Archipelago as it's main storage backend. Use the
new class attribute to instantiate ModularBackend class
appropriately.

Export a KVM variable. This can be used to overwrite the executable for
the kvm command.

Rename PITHOS_INPUT_DB and PITHOS_INPUT_DATA to PITHOS_DB
and PITHOS_DATA respectively.

Change note message to reflect relevant commit changes.

Drop support for installing snf-image packages in Ubuntu 12.04 LTS and
add support for 14.04

Bump version to 0.15.2next

Conflicts:
	docs/version.py
	version
	version.m4

Newer versions of automake raise errors when multiple AM_INIT_AUTOMAKE
entries are defined.

PITHOS_INPUT_DATA env variable and '--data' option are not used
in Synnefo version 0.16.

Synnefo version 0.16.0 completely removes the selectable storage backend
for Pithos, and introduces an integration with Archipelago, resulting in
necessary changes to the ModularBackend class.
In order to keep backward compatibility with older Synnefo versions, we
check the Pithos backend version and instantiate the ModularBackend
class appropriately.

This is to allow multi-line base64 encoded data in the "contents"
attribute of img_personality.

Fixes #51

Fix a bug in export script where the check of whether to use the
$EXP_SIZE_FD file descriptor was wrong.

This fixes #47

Bump version to 0.15.1next

Conflicts:
	docs/version.py
	version
	version.m4

* Remove obsolete parts from the /etc/default/snf-image sample file
  shown in the configuration section.
* Update the documentation about having made the img_passwd an
  optional parameter.

OS Parameters defined as command-line arguments should overwrite the
ones given in the variants file.

Many thanks to Brian Candler https://github.com/candlerb for the
suggestion and all the help.

Many thanks to Brian Candler https://github.com/candlerb for pointing
this out. This fixes #39

If the parameter is not defined then the ChangePassword task will not
run at all.

This resolves #34

If the variant file has defined mandatory input variables like IMG_ID
the verification script should not fail to find them.

This fixes #35

snf-image wasn't working correctly with API versions prior to 20 anyway.

Update ChangeLog and version files for snf-image 0.15

Update ChangeLog and version files

Replace all references of `environmental variable' with `environment
variable'

Handle better possible backend options and require necessary
ones by printing appropriate error messages.

Update Changelog and version files.

Synnefo version 0.15.1 has introduced a selectable storage backend
for Pithos, resulting in necessary changes to the ModularBackend class.
In order to keep backward compatibility with older Synnefo versions,
we check the Pithos backend version and instantiate the ModularBackend
class appropriately.