ENH: allow duplicate column names if they are not merged upon#10639

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jdrudolph wants to merge 3 commits intopandas-dev:masterfrom

jdrudolph:merge_on_unique_common_cols

Commits on Jul 20, 2015

allow duplicate column names if they are not merged upon
jdrudolph
committed

Commits on Jul 23, 2015

release note
jdrudolph
committed

Commits on Jul 27, 2015

clarified whatsnew
jdrudolph
committed