Newton Mayor Setti Warren has proposed raising his own salary by $27,125 in the budget plan he presented to aldermen this week. Warren, a former candidate for US Senate, is recommending that his salary climb next fiscal year to $125,001, a 28 percent increase from his current annual pay of $97,876. “It’s not about me, it’s about the office of mayor,’’ said Warren, who is halfway through his first four-year term.