NGcredit()
 Returns the Credits on the current guide
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 Function:      NGcredit()

 Syntax:        NGcredit() --> aCredit

 Description:   Returns an Array filled with Credit lines. Each
                guide can have up to 5 credit lines. They generally hold some
                general information about the guide, and are typically
                displayed under the 'HELP' key.

                The Array can be of 0 length (no credit lines), up to 5
                credit lines. Each line has a maximum length of 65 characters.

 Returns:       an Array, composed of 0 up to 5 strings.

 Example:       aEval(NGcredit(),{|s|Qout(s)}))