frozenset should just be shown as a set

[sjd201]

frozenset({'__UProject__', '__SEMA__', '__App__'})

should appear as

{'__UProject__', '__SEMA__', '__App__'}

Also, it would be good if we could specify sets using the curly brace notation instead of having to use the set([1,2,3])

This

> h = {1,2,3}
   Syntax Error: h = *{1,2,3}

not this

> h = set([1,2,3])
 > h
   frozenset({1, 2, 3})

[sjd201]

Actually, because the language is declarative there is no differences between sets and lists, so this should come back looking like a list.