WIP: Add memory efficient meta data summary#1030

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moloney wants to merge 9 commits intonipy:masterfrom

moloney:enh-metasum

Commits on Aug 1, 2020

WIP: Initial meta summary work
moloney
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Commits on Jul 12, 2021

Commits on Jul 13, 2021

ENH: Get the nd_sort method mostly working w/ basic tests
moloney
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Merge branch 'enh-metasum' of github.com:moloney/nibabel into enh-metasum
moloney
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