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DictAdd

Add a pair key, value to a dictionnary object.
If the key already exists, it will be overwritten and the old pair will be freed.
If the value is nil, "" will be stored.

Prototype :

fun [Dict S u0] I

• Dict : a dictionnary Scol object.
• S : a key
• u0 : a value

Return : I 0 if ok, nil if an error occurs.