NEW YORK (Reuters) - A star-studded lineup will sing and speak at pop star Whitney Houston's funeral, from Alicia Keys and Kevin Costner to the soul and gospel music royalty from which she hails, including her cousin Dionne Warwick and Aretha Franklin. Houston will be laid to rest on Saturday after an invitation-only memorial service at the New Hope Baptist Church in Newark, New Jersey, where Houston groomed her voice singing in the church choir with her mother Cissy Houston, a soul and gospel singer who once backed up Franklin. ...