#3 refactor hasAskUserRDQLValueFilter

[Andrew W Crapo]

The property of Frame named hasAskUserRDQLValueFilter
has range xsd:string and is obsolete. It predates the
concept of ServerSideScripts and should be
generalized to use a ServerSideScript. The property
could be for any class in the range of a property
which is a subproperty of askUserProperties and would
point to a filtering script to determine which
instances of the class should be included in the list
of possible values.