Dggrid4py

- better SEA7H seqnum conversion
- to better work with newer DGGRIDv8 and GDAL version
- ReadTheDocs

- main new feature is the possibility to split the geometries at the dateline 180/-180 which can make it easier to work in "regular" cartesian GIS tools
- another minor update is the possibility to configure the datatype of the intermediate DGGRID output. If possible it will try to use something more efficient such as GPKG or FlatGeobuf to reduce the overhead from DGGRID output and then loading into the GeoDataFrame
- welcome to contributor [Luís de Sousa](https://github.com/ldesousa), who provided the dateline interruption code the

A set of python modules for creating and manipulating Discrete Global Grids with DGGRID version 7.0 software which was created and maintained by Kevin Sahr.