Added parser for VAR TYPE-SPEC FROM/UPFROM FORM TO/UPTO FORM.
Added parser for VAR TYPE-SPEC TO/UPTO FORM FROM/UPFROM FORM.
Respect evaluation order.
Added parser for VAR TYPE-SPEC FROM/UPFROM FORM BY FORM.
Added parser for VAR TYPE-SPEC BY FORM FROM/UPFROM FORM.