fedstat_data_ids_filter
                        Filters 'data_ids' based on 'filters' that are
                        given in JSON format
fedstat_data_load_with_filters
                        Download subset of indicator data from
                        fedstat.ru by specifying filters in JSON
fedstat_get_data_ids    Get data filters ids from fedstat.ru indicator
                        web page
fedstat_indicator_info
                        Download indicator information
fedstat_indicators_names_database
                        Database of all indicator names presented on
                        the fedstat.ru with hierarchical grouping
fedstat_parse_sdmx_to_table
                        Parse sdmx raw bytes to data.frame
fedstat_post_data_ids_filtered
                        Post data filters ids to fedstat.ru and
                        download specified subset of data
parse_js1               Get data ids from java script source
parse_js2               Get default data ids object ids from java
                        script source
