Eodag

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- Fixes bug due to the new version of PyYaml
- Updates documentation and tutorial
- Automatically generates a user configuration file in ``~/.config/eodag/eodag.yml``. This path is overridable by the
``EODAG_CFG_FILE`` environment variable.

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- Creates a http rest server interface to eodag
- Switches separator of conversion functions in search parameters: the separator switches from "$" to ""
- In the providers configuration file, an operator can now specify a conversion to be applied to metadata when
extracting them from provider search response. See the providers.yml file (sobloo provider, specification of
startTimeFromAscendingNode extraction) for an example usage of this feature
- The RestoSearch plugin is dismissed and merged with its parent to allow better generalization of the
QueryStringSearch plugin.
- Simplifies the way eodag search for product types on the providers: the partial_support mechanism is removed
- The search interface is modified to return a 2-tuple, the first item being the result and the second the total
number of items satisfying the request
- The EOProduct properties now excludes all metadata that were either not mapped or not available (mapped in the
provider metadata_mapping but not present in the provider response). This lowers the size of the number of elements
needed to be transferred as response to http requests for the embedded http server
- Two new cli args are added: --page and --items to precise which page is to be requested on the provider (default 1)
and how many results to retrieve (default 20)

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- Creates Creodias, Mundi, Onda and Wekeo drivers
- Every provider configuration parameter is now overridable by the user configuration
- Provider configuration is now overridable by environment variables following the pattern:
EODAG__<PROVIDER>__<CONFIG_PARAMETER> (special prefix + double underscore between configuration keys + configuration
parameters uppercase with simple underscores preserved). There is no limit to the how fine the override can go
- New authentication plugins (keycloak with openid)

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- Silences rasterio's NotGeoreferencedWarning warning when sentinel2_l1c driver tries to determine the address of a
requested band on the disk
- Changes the `DEFAULT_PROJ` constant in `eodag.utils` from a `pyproj.Proj` instance to `rasterio.crs.CRS` instance

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- Updates catalog url for airbus-ds provider
- Removes authentication for airbus-ds provider on catalog search

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- Enhance error message for missing credentials
- Enable EOProduct to remember its remote address for subsequent downloads