By Paul Carrel and Andreas Framke FRANKFURT (Reuters) - The European Central Bank is closer to lowering interest rates than at any time since it last cut them in July 2012 and is likely to shave a quarter-point off at its policy meeting next week. Senior sources involved in the deliberations say momentum is building for action to help a euro zone economy which has slipped back into recession, a move that some policymakers wanted to take earlier this year. ...