WIP/ERR: raise consistent errors for non-existent files#30264

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jbrockmendel wants to merge 10 commits intopandas-dev:masterfrom

jbrockmendel:errs-io2

Commits on Dec 13, 2019

ERR: raise consistent errors for non-existent files
jbrockmendel
committed

Commits on Dec 14, 2019

skip if no xlrd
jbrockmendel
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Commits on Dec 16, 2019

Commits on Dec 18, 2019

Commits on Dec 19, 2019

Commits on Dec 20, 2019