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And use more uniform variable names.

This one (previously solve_elem_of) was hardly used. The tactic that uses
naive_solver (previously esolve_elem_of, now solve_elem_of) has been
extended with flags to say which hypotheses should be cleared/kept.

These are hardly used, and confusing since we have so many operations of
different arities that distribute.

These are unused and not very useful anymore now that we have gmap.

Also, use a different encoding of lists.