class methods

12.2: adda/oop/class methods:
. how does adda do  an objc class method?
. there are notes already but here's review:
t.type: ((instance methods declared here));
t`classmethod().proc -- a class method
. you could also have everything in the interface,
distingishing {class, instance} with the usual keywords:
# self`f(x), `f(x) -- instance method (the default)
# class`g(x) -- class method .
[12.3:
. this basically mirrors the way obj'c does it .]