Fix fetching all the series of a dataset.
Breaking changes in Python API:
fetch_seriesfunction: renamecode_masktoseries_code. Before it could only be a mask. Now it's possible to use it as a normal series code or a mask.
Breaking changes in column names:
- Rename
periodtooriginal_period, andperiod_start_daytoperiod.
Breaking changes in Python API:
- Remove
period_to_datetimekeyword argument from functionsfetch_seriesandfetch_series_by_api_link. A new column namedperiod_start_dayhas been added to theDataFrame, which contains the first day of theperiodcolumn. This has been done because some periods formats are not understood by Pandas, for example "2018-B2" which corresponds to march and april 2018. See also: https://git.nomics.world/dbnomics/dbnomics-data-model/ for a list of periods formats.