By Canan Sevgili LONDON (Reuters) -Global debt hit a record high of $337.7 trillion at the end of the second quarter, driven by easing global financial conditions, a softer U.S. dollar and a more accommodative stance from major central banks, a quarterly report showed on Thursday. The Institute of International Finance, a financial services trade group, said that global debt rose over$21 trillion in the first half of the year to $337.7 trillion. China, France, the United States, Germany, Britain, and J ...