[ale] 0.9.x release plans

[Gregory Maxwell]

On Fri, Apr 4, 2008 at 11:34 PM, David Hilvert <dhilvert at gmail.com> wrote:
> 0.9.0 will probably soon be released, with the following changes, already
>  roughly complete in the git repository:
>
>  * Miscellaneous bugfixes
>  * Optional backing store for (large) images
>  * Multiple alignments per frame, as suggested by Rob Stewart
[snip]

I've been following the changes in darcs and saw the multiple
alignment stuff but I wasn't entirely clear about what it is supposed
to do.

Care to expand on it?