Re-requesting series pull

New version here. Changes include:
1. Instead of "Top Stories" post prominence term, creates a new "Featured in Series" term that is used in the optional post order dropdown.
2. Fixed the DB query on that sort order to actually, like, work (since it wasn't before)
3. Retooled handling of the footer so that there's now a choice between none, widget, and custom HTML. 

You may need to delete and re-create any Series Landing Pages you had because of the changes to the footer implementation.

The footer widget implementation is still pretty rudimentary, as you flagged earlier. To keep the number of regions under control I think it makes sense to just create a single region, but should be easy enough to put widgets into 3 columns by adding some spanX classes (or similar) around line 585 of cftl-admin.php, or just writing some additional CSS.