fix: ensure tools can load datasets that are exactly 4kiB#124

nfrasser merged 4 commits intorelease-v4.7cryoem-uoft/cryosparc-tools:release-v4.7from

nick/T-5123-dataset-4k-load-fixcryoem-uoft/cryosparc-tools:nick/T-5123-dataset-4k-load-fixCopy head branch name to clipboard