DEPR: deprecate cols / change to columns in to_csv / to_excel#6686

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jsexauer wants to merge 2 commits intopandas-dev:masterfrom

jsexauer:fix6645

Commits on Mar 22, 2014

Fix #6645. Raises warning on use of cols and update unit tests
jsexauer
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Fix docs to use correct pivot_table arguments [#6645, #5505]
jsexauer
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