NGparent()
 Return Parent List Information
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 Function:      NGparent()

 Syntax:        NGparent() --> aParentInfo

 Description:   In any NG entries, this returns the Adress of the Entry
                one would get using the [Esc] key in the NG program.

 Returns:       The value returend is an Array with 2 elements. The 1st
                element is the Entry (adress) of the parent entry, or -1 when
                there is no parent (then the parent is a Menu, for intance).
                The 2nd element is the line number in the parent Short List
                under which the current entry lies.

 Example:       See demo program.