This at least makes it work --- I think it's right - don't know - too hard to work out all the changes.
<!-- IF S_SLIDESHOW_ENABLED -->
<!-- INCLUDE ALBUM_TPL_PATH album_slideshow_inc_js.tpl -->
And in the meantime it appears that one must at least
for it to work with other themes such as:
As adding "Dummy" folders with the required album files to the album/templates folder - doesn't work..