Threedigrid

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- Release on pypi (repo has no Github actions)

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- Replace nan with null in geojson output.

- Remove requirements files, only keep one for development in docker.

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- Bugfix: geojson levees export also crashed
due to 3.8.10 and numpy 1.19.1

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- Fixed only filter for aggregate result admin. (121)

- Added cross_pix_coords field to lines.

- Bugfix: geojson line_geometries export crashes with
Python 3.8.10 and numpy 1.19.1. Needed explicit astype conversion

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- Reduced the source distribution filesize by removing the tests.

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- Bumped asyncio-rpc to 0.1.10

- Fixed GeoJSON export with pyproj <= 1.9.6.

- Fixed compatibility with h5py 3.*.

- Added gridadmin.grid.transform.

- Fixed gridadmin.grid.n2dtot and .dx propagation.

- Added gridadmin.cells.iter_by_tile() and .get_extent_pixels().