LONDON (Reuters) - World shares climbed to a six-week high alongside benchmark government bond yields on Friday, as markets cheered signs of progress in U.S.-China trade talks and another powerful slug of stimulus from the European Central Bank.It was a bit of a groggy start in Europe after it emerged not all of the ECB's member country's had wanted to restart its money printing programme, but the main bourses eventually added 0.2% to what was already set to be a fourth straight week of gains...