Moved SetFunction tests, and tagged slower tests as such for nose.
Remove points hash algorithm, in favour of the new way of representing sets.
Domain.points() now returns real Points.
Remove MutableDomain, make Domain a frozenset (rather than a frozen OrderedSet), test fixes.
Fix Func for Var not having ordered values.
Fix Point __str__ sorting, test fixes.
More test fixes.
Set test fix.
Further fixes.