Preparing release 2.4.4

improved setup description

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Oops

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added test, bump version for release

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added support for descriptions in OAI Identify headers

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raise correct error when from and until parameters have different gra…

…nularities

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Generate BadArgument error when bad datetime is used in from or until…

… arguments

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bumped versions, prepared for release

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Remove this, wrong tag, wrong number for version.

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Add in URL.

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