x_latitude, x_longitude reporting

Several servers have latitude and longitude reported in their info blocks.  For example,

```
https://imag-data.bgs.ac.uk/GIN_V1/hapi/info?dataset=aae/definitive/PT1M/native
```

contains 

```
"x_latitude": 9.034999999999997,
"x_longitude": 38.77,
"x_elevation": 2441
```

