Process queries for HexGrid objects.
:param request: HTTP GET request
:return: JSON format of HexGrid (only pk and count) or GeoJSON of the geom of HexGrid.

GET /api/occurrence/grid/?taxon=7982111
HTTP 200 OK
Allow: OPTIONS, GET
Content-Type: application/json
Vary: Accept

{
    "features": [
        {
            "properties": {
                "pk": "442537"
            },
            "type": "Feature",
            "geometry": {
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                            ],
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                            ],
                            [
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                            ],
                            [
                                1250004.31281552,
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                            ],
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                            ],
                            [
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                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442577"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
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                            ],
                            [
                                1250004.31281552,
                                -2020726.88432782
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442593"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
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                            ],
                            [
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                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442632"
            },
            "type": "Feature",
            "geometry": {
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                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442633"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
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                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442646"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
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                            ],
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                ],
                "type": "MultiPolygon"
            }
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        {
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            "type": "Feature",
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                "type": "MultiPolygon"
            }
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        {
            "properties": {
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                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442700"
            },
            "type": "Feature",
            "geometry": {
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                            ],
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                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442702"
            },
            "type": "Feature",
            "geometry": {
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                    [
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                            [
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                "type": "MultiPolygon"
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        {
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            "type": "Feature",
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        {
            "properties": {
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        },
        {
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        {
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        {
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    "crs": {
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}