Backport PR #13413 on branch v3.1.x (Simplify decade up- and down-rounding, and symmetrize expansion of degenerate log scales.)#13508

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Feb 24, 2019

Commits on Feb 24, 2019

Backport PR #13413: Simplify decade up- and down-rounding, and symmetrize expansion of degenerate log scales.

tacaswell
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