Redefined clause class and parsers.
Moved function to component utilities.
Eliminated duplicate generic function.
Method for computing the bindings of a FOR-AS-EQUAL-THEN-CLAUSE.
Method for computing the declarations of a FOR-AS-EQUAL-THEN-CLAUSE.
Method for computing the prologue of a FOR-AS-EQUAL-THEN-CLAUSE.
Method for computing the step of a FOR-AS-EQUAL-THEN-CLAUSE.
Accept any expression as the d-var-spec.  Analyze later.