Converters are manually accessed through the edit_data interface (same as metadata).
Converters to load are specified by datatype_converters_conf.xml, see
datatype_converters_conf.xml.sample.
Converters are defined in XML using the same format as tools, and use the same
internal components.
datatype_converters_conf.xml and the converter path can be changed in the
universe_wsgi.ini file.
