Improved sklearn class compatibility and compliance, which resulted in some parameters of classes having an underscore appended to their name during fit, such as:

• :class:`mne.decoding.FilterEstimator` parameter picks passed to the initializer is set as est.picks_
• :class:`mne.decoding.UnsupervisedSpatialFilter` parameter estimator passed to the initializer is set as est.estimator_

Unused verbose class parameters (that had no effect) were removed from :class:`~mne.decoding.PSDEstimator`, :class:`~mne.decoding.TemporalFilter`, and :class:`~mne.decoding.FilterEstimator` as well. Changes by `Eric Larson`_.