Eodag

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- Updates documentation for custom field

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- Adds custom fields for query string search
- Adapts to new download interface for sobloo

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- Fixes :issue:`97`
- Fixes :issue:`96`

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- Adds product type search functionality
- Extends the list of search parameters with ``instrument``, ``platform``, ``platformSerialIdentifier``,
``processingLevel`` and ``sensorType``
- The cli arguments are now fully compliant with opensearch geo(bbox)/time extensions
- Adds functionality to search products by their ID
- Exposes search products by ID functionality on REST interface
- Exposes get quicklook functionality on REST interface
- Fixes a bug occuring when ``outputs_prefix`` config parameter is not set in user config

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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)