Extend exrstdattr to add -erase option #1688
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Signed-off-by: Peter Hillman <peterh@wetafx.co.nz>
Signed-off-by: Peter Hillman <peterh@wetafx.co.nz>
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Add a flag to permit attributes to be removed using exrstdattr, as well as modified or removed. It's also possible to change the type of an attribute, by erasing it and re-inserting it. Some attributes are essential to OpenEXR to write the file correctly. Those are specifically detected and cannot be removed.
test_exrstdattr.py is also extended to check
-erasedoes what it should. I notice that this didn't actually clean up the temporary file it made. Perhaps that should be added too?