Sentinelsat

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Added
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* validate downloaded products with their MD5 checksums

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Added
~~~~~

* option to select a different dhus api ``--url``

Changed
~~~~~~~

* ``https://scihub.esa.int/apihub/`` as standard url

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Added
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* method to manually select the CA certificate bundle
* function to return footprints of the queried Sentinel scenes

Fixed
~~~~~

* CA-certificate SSL errors

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Added
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* ``--query`` parameter to use extra search keywords in the cli

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* first release