get_scrorer now warns if you use an old name for a scorer
and tests have been updated to use new naming convention.

Maintain old names during the deprecation period and update
tests to use better variables names.

Treat (callable) instances different from functions in
the deprecated decorator

Also update tests for new behaviour and ensure there are warnings for some changed and confusing (pity) behaviours.

Makes the distinction between the metric and the scorer a bit
easier for the reader.

…uldn't touch anything. (#5540)

* BF: issue 5522 (cloning objects with pandas.Dataframe attributes)

* super conservative fix, pending GP and VBGMM fixes.

* TST improved test for df param

* add deprecation warning, add whatsnew entry

* fixed place of deprecation warning, added test for deprecation warning.

* pep8

* fix whitespace error

…ing scipy or numpy with pip. (#7313)

[MRG + 2] Rename scorers like `mse` to `neg_mse`

[MRG + 1] Complete deprecation of default average in P/R/F metrics

…#7331)

* FIX use high precision cumsum and check it is stable enough

Fix sampling in stratified shuffle split, break tests that test sampling.

Added a bugfix report to whats_new.rst. Modified a unit test to check for the kind of problems caused by isclose.

…fit and transform (#7374)

…and added test

[MRG] Fix for MLP multilabel predict_proba and removal of decision_function

* TST Stronger test for _check_is_permutation

* TST Ensure additional duplicate indices are caught