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Fix memory alignment bug affecting 32 bit sky maps

Leo P. Singer requested to merge leo-singer/ligo.skymap:moc-float32 into main

Fix a memory alignment bug that caused ligo.skymap.moc.rasterize and ligo-skymap-flatten to produce incorrect results for multiresolution sky maps that have an odd number of 32-bit columns. This impacted Swift BAT GUANO localizations which have a single 32-bit PROBDENSITY column.

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