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Added
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* filesystems are now set up by default from the URIs' protocols, so no need to use stac_io/filesystem anymore if config files are available.
Changed
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* The rasterio driver does not support load=False anymore - at least until raster=1.3 is out. fsspec now takes care of downloading the assets.
* Relative HREFs are used for the assets if possible, making Catalogs more self-contained.