Add 'special_ids' to seriesparser

Allow list of identifiers which will cause entry to be id'd as a special
to be extended.
Add ability to specify 'special_ids' to series

Allow list of identifiers which will cause entry to be id'd as a special
to be extended.
Add 'special_ids' support to configure_series

Will now be set for generated series from entry['configure_series_special_ids']