Spotlight option to show next/prev buttons.
spotlightlisting: move thing insertion and javascript setup to functions.
Use adzerk for spotlight.
only retrieve frontpage srs if we're gonna use them
starting to move adzerk ids to config

NOTE: need to update example.ini
adzerk self serve work in progress
stash: debugging adzerk
some utility functions for adzerk
more work on adzerk_selfserve
Add hooks in promote.
pulling adzerk stuff out into plugin