assert.m: Wrap expected/observed strings in single quotes when printing errors. This enhances clarity for empty strings which are displayed as a blank, but are now displayed as ''. See https://octave.discourse.group/t/display-single-or-double-quotes-to-help-understand-output-in-assert-m/3606 * assert.m: Wrap expected/observed strings in single quotes when printing errors.

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[*]
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[*.{am,mk}]
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