Another major credit-rating house says the next 50 days of Illinois state budget-making will be “pivotal” to the state’s financial health.  Standard & Poor’s Ratings Services issued the statement Wednesday.  Lawmakers must approve a budget for the coming year by the end of May.  Governor Pat Quinn proposed a budget last month that relies on making a temporary income tax increase permanent to avoid a $1.8 billion revenue hole.  S&P says the plan could help the state’s finances by preventing sharp spending reductions.  But it noted the budget still leans on non-recurring revenue such as an inter-fund loan and reliance on Medicaid reform and other cost-containment.  Moody’s Investors Service and Fitch Ratings issued similar outlooks last week.