The deal is on: World market themes for the week ahead

As global growth worries grow, the coming days could be defined by relief if further U.S. trade deals come through - with focus on China - or more pessimism if data disappoint. U.S. President Donald Trump heads to the Middle East, Asian currencies are on the rise, and Germany's new leader just got off to a wobbly start. Here's your heads-up on the week ahead in financial markets from Amanda Cooper, Karin Strohecker and Dhara Ranasinghe in London, Rae Wee in Singapore, and Lewis Krauskopf in New York. Saudi calling Trump's first major diplomatic trip kicks off next week with…