Bugfix/fix meta getitem

Fixes arosics#88 (closed) and improves coverage of GDAL_Metadata class.

added Bugfix Enhancement labels

assigned to @danschef

added 6 commits

• 20f5305b - Fix np.integer handling.
• f9de6228 - GDAL_Metadata.__getitem__ should consistently subset by band, not by metadata key.
• fa0da795 - Catch mixed / unexpected input types.
• 83cadfc1 - It should be a ValueError.
• 57cbc3f7 - Add tests to fully cover GDAL_Metadata.__getitem__ and get_subset.
• 95a2777b - Update HISTORY.rst.

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enabled an automatic merge when the pipeline for 95a2777b succeeds

aborted the automatic merge because source branch was updated

added 1 commit

• 39f44f41 - Fix linting issues.

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merged

mentioned in commit ef33cae4