[mythtvnz] Detect missing schedule items

[Nick Rout]

I wonder if the technologies in shepherd http://svn.whuffy.com/wiki
are any use here?

"Shepherd knows enough about the capabilities of each grabber in order
to make intelligent judgments about which is most appropriate for any
given situation, maximizing data quality while minimizing bandwidth
usage. It analyses the XML output from each grabber to determine
whether any further grabbers are required to obtain a full dataset of
the required channels. It then employs postprocessor components to
further refine the data: the imdb_augment_data postprocessor adds
movie information from IMDb.com, tvdb_augment_data adds series/episode
details from TheTVDB.com, flag_aus_hdtv marks shows that are available
in High Definition, and more.

When switching between data sources, Shepherd's reconciler keeps show
names consistent. For example, if you're used to recording a programme
called "House" but a different data source names it "House, M.D.",
Shepherd remembers the original name and automatically substitutes it.
"