New CAT call

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Introcution

The ECMA standard introduces a new solution to the CAT call problem. Covariant redefinition of a formal argument is only possible to an detatchable type: 

class 
   Y
feature
   a: B
   g 
      do
         a.f1
      end
end
 
class A
feature
   f (a: ANY) do end
 
class B
feature
   f (a: STRING) do end   -- not valid
class B
feature
   f (a: ?STRING) do end   -- valid
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