Jennifer Aniston is reportedly considering publishing a long-rumoured memoir that could finally offer her own account of some of Hollywood's most scrutinised personal moments, including her 2005 divorce from Brad Pitt and the fallout surrounding his subsequent relationship with Angelina Jolie. According to Heatworld, the 57-year-old actress is weighing up a tell-all book deal that sources suggest could command an advance of up to $20 million. Sp…