Store sparse state file images as fch5 - #2044
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Sparse unsigned-integer imageseries are written as fch5 frame caches (lossless at threshold=0), which saves much faster and smaller than the dense layout. Signed, float, or non-sparse data keeps the dense blosc-zstd path, and loading detects the format per detector group, so older state files still load unchanged. Signed-off-by: Patrick Avery <patrick.avery@kitware.com>
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Sparse unsigned-integer imageseries are written as fch5 frame caches (lossless at threshold=0), which saves much faster and smaller than the dense layout. Signed, float, or non-sparse data keeps the dense blosc-zstd path, and loading detects the format per detector group, so older state files still load unchanged.