BERLIN (Reuters) - German annual inflation accelerated at low levels in June, preliminary data showed on Monday, but remained well below the European Central Bank's target, providing further justification for stimulus.German consumer prices, harmonised to make them comparable with inflation data from other European Union countries, rose by 0.8% year-on-year, compared with 0.5% in the previous month, the Federal Statistics Office said.The reading compared with a Reuters forecast for 0.6%.On the..