NOTTINGHAM, England, Feb 22 : Liverpool midfielder Alexis Mac Allister struck a winner deep into stoppage-time as his side snatched a scarcely-deserved 1-0 win at Nottingham Forest in their Premier League clash on Sunday.  After a pedestrian 90 minutes in which they barely managed a shot on target, Mac Allister lit the fuse with a stoppage-time effort that was ruled out for handball before rifling home a rebound in the 97th minute to snatch the win. Liverpool's attacking struggles began before