The FTSE 100 nudged into positive territory on Friday in a muted end to the week, with big oil helping to offset falls in commodity-related stocks. BP (BP.) and Royal Dutch Shell (RDSB) rose 1.7% and 1.3% to 342.4p and £16.514 respectively, tracking firmer crude prices after OPEC+ said it would review supply additions ahead of its next scheduled meeting if the Omicron variant dents...