Return the Datastore that currently backs the Album. If no images have
ever been added to the Album, then this will be null. Otherwise, the
Datastore may potentially be frozen, if the user has saved the Album and
then not created a new one yet.
Add the specified Image to the Album's datastore. If no Datastore exists
for the Album yet, or if the current Datastore is frozen, or if the
channel has changed, then a new Datastore will be created, as well as a
new DisplayWindow to go with it, and future additions will be sent to
The channel name used for the image will be the current channel (i.e. the
config setting for the config group set as the channel group), or "" if
it does not exist.
image - The Image to add to the album
True if a new Datastore and DisplayWindow were created as a
side-effect of adding the image.