[ansel] Ansel::listGalleries()

[Ben Chavet]

> gallery pros:
> - gallery also has the ability to move not only images, but also entire
> galleries around

This is something that I'd like to do sometime soon.

> - fast operation

Hopefully we can tweak the datatree driver to get better performance out of
ansel.

> - better (IMHO) interface than Ansel (check out
> https://www.outerspaceconsultants.com/gallery and

I gotta admit, that interface is pretty sweet.  I especially like the drop
shadows.

> - ability to dynamically rebuild thumbnails

Not sure what you mean by dynamically rebuild thumbnails.  Ansel can 
regenerate
all of the thumbnails in a gallery if necessary.  Currently, it requires
changing the thumbnail size for a gallery, but certainly this can be expanded.

> - hacks to add the ability to show last X images uploaded to all
> galleries (or just one) and to show X random images

Also nice.  I've contemplated on a simular feature for a while, but 
haven't come
up with anything concrete yet.

> gallery cons:
> - uses image magick for image manipulation (doesn't use GD2)

I use imagemagick with ansel & couldn't be happier.

> Just some considerations if/when those features ever get added to Ansel.

Some excellent points here.  Thanks for doing the research.

> Let me know if you need any help tracking down the issue with the
> ordering of entries for the XP publish interface.  I just did a quick
> workaround where I sorted the returned entries in the XP publish code.
> Not the right answer, but it worked for the time being.

The image-moving feature I just committed uses the same hack that you 
put in the
XP Publishing.  This should help me track the problem down easier, since I
won't have to boot into windows to test it.  I just didn't want to duplicate
any efforts made by anybody else.  So, we'll see what happens now :)

--Ben