[PRD] Assert and AssertRetract test cases (ACTION-845)

Adrian, all,

I reviewed the AssertRetract test case [1], as part of ACTION-845, and I 
found that an object is retracted - Retract(?X) - and, then, a new frame 
is asserted about that same object - Assert(?X[ex:discount -> "0"]).

Although the spec says only that the retraction of an object removes from 
the fact base all the facts where the object occurs in the 'object' 
position, I think that the intention was that the object be, in facts, 
deleted, thus forbidding any assertion about it in the action part, after 
the retraction.

Shall we specify this more precisely, e.g. saying that the semantics of 
Assert and Modify is undefined if the object has been retracted? (Notice 
that Retract does not remove the frames where the retracted object occurs 
as a value, nor any predicate where the object occurs as an argument; thus 
leaving the possibility of dangling references to the object).

Btw, Adrian, there is not XML for the AssertRetract nor the Assert [2] 
test cases.

Cheers,

Christian

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