Muninn-sentinel5p

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* Remove S5P_ prefix from product type names.

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* Add support for LUT_CH4RFC.

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* Add 'namespaces' property to product type extension.

* Use property methods for muninn product type api properties.

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* Set creation_date equal to validity_start for AUX_NISE__.

* Add support for additional auxiliary product types.

* Remove file class from product_type names. This requires a data migration of
any existing database. This can be done using e.g.
UPDATE core SET product_type=substr(product_type,0,15) WHERE product_type LIKE 'S5P%';

* Change default hash type to 'md5' for all products.

* Add filename_only argument to analyze() functions.

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* Added support for Auxiliary S5P products.

* Made orbit, collection, and processor_version namespace attributes optional.
This will require a migration of the database::

ALTER TABLE s5p ALTER COLUMN orbit DROP NOT NULL;
ALTER TABLE s5p ALTER COLUMN collection DROP NOT NULL;
ALTER TABLE s5p ALTER COLUMN processor_version DROP NOT NULL;

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* First release.