Add support for column separators in arrays (#127).#168

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aweinstock314 wants to merge 3 commits intojgm:masterfrom aweinstock314:master

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Commits on Jan 10, 2021

Add support for column separators in arrays (jgm#127 ).
aweinstock314
committed
Fix some handling of "columnlines" in {Readers,Writers}.MathML and update the tests.
aweinstock314
committed
Deduplicate "columnalign" and "columnlines" in the MathML writer, fix an off-by-1 in the TeX reader, and add the augmented matrix example to the test suite.
aweinstock314
committed