Musician Nell Mescal on heartbreak, Haim and her big brother, Paul

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Nell Mescal is stubborn and impatient. Or so she claims, at any rate. From where I’m sitting, opposite the Irish singer-songwriter in a north London café, the 22-year-old comes across as thoughtful and easy-going. But, she insists, it is stubbornness that  defines her personality and impatience that makes her music what it is. “It’s exciting to release songs as…