Anger is growing in Mexico over a fire at a government-run day care center that claimed its 46th child this weekend. Parents of the dead children and their supporters have held two noisy rallies in Hermosillo, the city in northwestern Mexico where the fire broke out June 5. They blame the government for laxity in enforcing safety regulations, for conducting a weak investigation and for failing to punish anyone in the 10 days since the fatal blaze