By Ghaida Ghantous DOHA (Reuters) -Top EU diplomat Josep Borrell said on Saturday Iran and world powers were “very close” to agreement on reviving their 2015 nuclear deal, which would curb Tehran’s nuclear programme in exchange for lifting tough sanctions. Meanwhile Iran’s foreign minister appeared to show flexibility on an issue which has been a leading sticking point in the nuclear talks, and Yemen’s Iran-aligned Houthi group launched an apparent peace initiative to end a seven-year war. Then-U.S. President Donald Trump abandoned the pact in 2018, prompting Tehran to start violating its nucl…