Gpm-precipitation-tools

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* Remove requirements.

* Fix bug in monthly data download.

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* Update gdal version to 2.2.2.

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* Fix gdal compatibility issues (hopefully!) - add setuptools to install requirements and versions to all required packages.

* Fix issues with the ``process_timeseries_files_pipeline.py`` script.

There are still some issues sometimes in some cases with cftime.

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* Add PyQt5

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* Remove cartopy

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* Fix libraries imports