Modification to resolution handling in TIFF reader / writer#4185

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ruven wants to merge 3 commits intolibvips:masterfrom

Commits on Oct 6, 2024

Modified TIFF reader to set resolution to zero if no resolution set within TIFF file.
ruven
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Resolution only set when saving as PNG if resolution is really known
ruven
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Made default X/Y resolution zero for Vips images rather than 1.0
ruven
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