0003513: There is no check for boundary of array in method Set for array attributes

- Added check of array's boundary in Set(i, val) methods.
- Added comments to cdl files.
- removed accidental modification in TDataStd_ExtStringArray::Value(i).
- recovering accidentally lost modifications.

src/TDataStd/TDataStd_ExtStringArray.cdl

@@ -60,6 +60,7 @@ is
 
     SetValue (me : mutable; Index : Integer from Standard; Value : ExtendedString from TCollection);
     ---Purpose: Sets  the   <Index>th  element  of   the  array to <Value>
+    -- OutOfRange exception is raised if <Index> doesn't respect Lower and Upper bounds of the internal  array.
 
     Value (me; Index : Integer from Standard)
     ---Purpose: Returns the value of  the  <Index>th element of the array