Load for each obsolete or deprecated ORPHAcode the corresponding association (Moved to or Referred to).
While load_raw_redirections keep the original id values for each Orphanet concept,
load_redirections translate them according to "RDaggregator_dict" option, which can be set manually using
built-in options() function or through the RDaggregator_options() interface.
Value
A data.frame object giving the deprecated or obsolete ORPHAcodes, the corresponding associations with the association type