Support for WKT conversion

[duncandewhurst]

We'll need to decide how to handle Flatten Tool's WKT conversion option. That will be informed by the outcome of GFDRR/rdls-spreadsheet-template#9 and OpenDataServices/flatten-tool#429.

[duncandewhurst]

We are using WKT for geometries in the spreadsheet template so we'll need to set the wkt option in Flatten Tool's kwargs.

[radix0000]

Added "convert_wkt": True

[duncandewhurst]

Doesn't seem to be working when testing with wkt.xlsx:

Expected output, as returned by flatten-tool unflatten -s schema/rdls_schema.json -m datasets -f xlsx --convert-wkt ../rdls-cove/test_data/wkt.xlsx:

{
    "datasets": [
        {
            "id": "1",
            "spatial": {
                "geometry": {
                    "type": "Polygon",
                    "coordinates": [
                        [
                            [
                                30.0,
                                10.0
                            ],
                            [
                                40.0,
                                40.0
                            ],
                            [
                                20.0,
                                40.0
                            ],
                            [
                                10.0,
                                20.0
                            ],
                            [
                                30.0,
                                10.0
                            ]
                        ]
                    ]
                }
            }
        }
    ]
}

Actual output from CoVE:

{
  "datasets": [
    {
      "id": "1",
      "spatial": {}
    }
  ]
}

Resulting error:

[radix0000]

Was a flattentool version issue. Let me know if looks good now.

[duncandewhurst]

Looks good to me. Thanks!