API/CLN: make rename and copy consistent across NDFrame #4627
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verifies #2721, #4039
closes #4605
TST: add tests/test_generic.py
API/CLN: Refactor rename methods to core/generic.py; fixes Series.rename for (GH4605), and adds rename
with the same signature for
Panel
API/CLN: Refactor Series.copy to core/generic.py; removes the order argument from Series.copy (inconsistent)