[FIX] Disable __eq__ and __hash__ because it can be slow #713
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It can be so slow that it appears Orange has crashed.
With @borondics we had a workshop in Berlin and preprocessing appeared to crash for most students. We thus downgraded to a previous version.
After debugging I saw that a series of preprocessors causes domain comparisons to be very long (for example, after normalization, each feature in turn references the whole original domain, and then equality checking just multiplies).