Brent, WTI post weekly fall of over 5% * Euro zone recovery gathers pace on services boost in April -PMI * Indian refiners' crude processing near record peaks in March * U.S.rig count climbs for first time in four weeks (Updates with prices, commentary) By Erwin Seba HOUSTON, April 21 (Reuters) - Oil prices edged higher on Friday on strong economic data in the euro zone and Britain, but futures fell for...