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* fixed raise of ``FileNotFounderror`` on ``mapchete.io.raster.read_raster_no_crs()``
* fixed overview ``get_parent()`` on zoom 0 in batch processing
* sort processes alphabetically in ``mapchete processes``
* always raise ``FileNotFoundError`` if input file does not exist
* wait for 1 second between retry attempts on file read error
* added ``--overviews`` and ``--overviews-resampling-method`` to ``mapchete convert``
* fixed overview generation when output pixelbuffer was provided (220)
* remote reading fixes (219)
* add GDAL HTTP options
* handle ``AccessDenied`` exception which could occur if after an ``RasterioIOError`` a check is run if the file even exists
* increased required minimum NumPy version to 1.16
* pass on output parameters to mapchete process (215, fixes 214)
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