fs: add fs.copy, fs.copySync, fs.delete and fs.deleteSync with docs and tests.#12583

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JOT85 wants to merge 14 commits intonodejs:masterfrom

JOT85:fs-copy-and-delete

Commits on Apr 22, 2017

fs: add fs.copy, fs.copySync, fs.delete and fs.deleteSync with docs and tests.
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Ammended docs: enclosed overwrite_mode in square brackets, corrected
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Commits on Apr 23, 2017

Replaced tabs with spaces and fixed linting issues.
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Remove directory after test
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Use var instead of let in for loop in fs.js and use assert.ifError instead of throw in test-fs-copy-and-delete.js
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Make the test dir if it doesn't already exist.
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Create the test directory if it doesn't exist.
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Modify times after writing in fs.copy and fs.copySync, in all async functions use a callback instead of promise when recursivaly calling.
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Don't fail on fs.delete when callback isn't a function.
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Don't test atimes as they will be modified when we run the read tests.
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Log process.platform and os.platform() in test scripts to determine what they are on aix.
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Don't call fs.futimes on aix platform.
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I made a stupid mistake and triggered fs.futimesSync for AIX and not
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Made sure that the test cannot fluke with timings.
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