LONDON — Noor Hussain Al-Malki sat in Lane 3, face in her hands, barely a dozen painful strides from where her first Olympic race began. It was a short, somewhat bittersweet and definitely unprecedented effort. The 17-year-old Al-Malki was the first Qatari woman to compete in track and field at the Olympics, after the country decided to include female athletes – four in total – in its delegation for the first time. [...]