BRASILIA (Reuters) - Brazilian President Michel Temer on Tuesday signed into law a new program for companies to renegotiate their overdue tax bills, providing extra revenue to cover a gaping budget deficit. The program, known as Refis, has collected 10.9 billion reais ($3.4 billion) in back taxes this year for the Treasury. Earlier this month, the Senate approved greater discounts to taxpayers in the program, depriving the cash-strapped government of about 3 billion reais. 