Update hdf5_1_12_1 version to 1.12.1-6#713

Merged

lrknox merged 17 commits intoHDFGroup:hdf5_1_12_1from lrknox:version_update

Jun 2, 2021

+18-18

Commits on May 19, 2021

Hdf5 1 12 doxygen version correction (#658 )

authored and
lrknox
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Attempt format uniformity in RELEASE.txt.
lrknox
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BUG: DataSet assignment operator is missing (#503 )

committed

Commits on May 21, 2021

Commits on May 22, 2021

More minor updates.
lrknox
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Commits on May 24, 2021

Merge branch 'hdf5_1_12_1' of https://github.com/HDFGroup/hdf5 into hdf5_1_12_1
lrknox
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Commits on May 25, 2021

Commits on Jun 1, 2021