Enhancement/speedup pointdata

added Enhancement label

added 3 commits

• 8ddd2d40 - GeoArray.__getitem__() now first reads a band subset instead of the whole...
• b0ae9270 - Fixed remaining test outputs aufter running Test_Geoarray.test_save().
• dedb4850 - Updated HISTORY.rst.

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marked this merge request as ready

mentioned in commit 4b0d5e73

merged