This can be overridden by custom harvesters willing to support non ISO
formats (like FGDC). It is called whrn the original_document and
original_format harvest object extras are present. Custom harvesters are
responsible for transforming the original document to ISO.
Prior to the merging of the new spatial harvesters, the existing ones
based on Gemini and UKLP have been moved to their own namespace
(ckanext.spatial.harvesters.gemini). The plugin points have been updated
so users currently using these harvesters will still be able to use them
as normal.
The base harvester (SpatialHarvester) has been updated with new methods,
most significally '_get_package_dict' and 'import_stage'. Note that
SpatialHarvester now extends HarvesterBase on ckanext-harvest, which had
some of its methods updated.
TODO: still some geo.data.gov specific bits!