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Make stacking estimators capable of replacing base estimator in searchcv (#522)

* introduce cross_val_predict to StackingCVRegressor

* fix test for stacking_cv_regression

* remove duplicate key-values from get_params of StackingCVRegressor

* make regressor replaceable in GridSearchCV for StackingCVRegressor

* changelog entry

* allow droping regressor in gridsearch for StackingCVRegressor

* make base parameter handler for estimators composed of a list of base estimators

* add a test for stackingcvregressor with gridsearch and update notebook documentation

* make stacking cv estimators more compatible with gridsearch

* update stacking_classifier and stacking_regressor with _basexcomposition

* add verbose to stackingcvregressor and fix test errors

* fix flake8 warnings

* update changelog

* update jupyter user guide

* update docs for api modules

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