For the past two months of the new government Dr. Cécile Kyenge has held down one of the toughest jobs in Italy. As Minister for Integration she must deal with such contentious issues as citizenship for children born in Italy of immigrant parents. Born in Congo, she came to Italy 30 years ago to study opthamology before entering politics in North Italy. For her pains, she has received death threats and literally obscene invectives. But summer weather is bringing new hordes of clandestine immigrants to the southern isle of Lampedusa, and aggravating an already difficult situation.