Fix miscellaneous invalid hyperparameter options in the configuration dictionary. And add n_jobs=1 when possible.

I went through some logs to check for classifiers, transformers, and selectors issues. Those seem to not generate invalid hyperparameter combinations. I have not checked regression yet.

It would also be good to check for extreme values that may be unreasonably slow or blow up memory. For example, when PolynomialFeatures was set to a high degree, it would often create extremely large matrixes that would blow up memory and potentially crash the system.

Also need to add n_jobs=1 to parameters that have an n_jobs parameter.