Fetcher improvements
- dataset name: "Global Mobility Report, percent change from baseline"
- dimension
places
, use shorter codes- "GRPH": "Grocery and pharmacy",
- "PARKS": "Parks",
- "RESID": "Residential",
- "RETREC": "Retail and recreation",
- "TRANSIT": "Transit stations",
- "WORK": "Workplaces"
- add a FREQ dimension
- add series names