LONDON, March 29 (Reuters) - European shares were expected to rebound on Friday, extending their new year rally ahead of a meeting of euro zone finance ministers that may boost the bloc's bailout power. Financial spreadbetters expected Britain's FTSE 100 to open 34 to 38 points higher, or as much as 0.7 percent, Germany's DAX to open up 50 to 54 points, or as much as 0.7 percent, and France's CAC-40 to open 26 to 31 points higher, or as much as 0.9 percent. Europe's STOXX 600 index