Filter compactdata-*.json using metadata.json content

imf-source-data contain compactdata-*.json from previous download. This is due to the use of ignore-removal git option. Series data can be found several times in different files. That leads to series.jsonl containing duplicate series.

imf-source-data constant growth has to be fixed

Prior to this, this patch filters compactdata-*.json to be read using metadata.json written during last download.