SPRINGFIELD — The political agony of a school-funding compromise was perhaps best summarized this week by House GOP floor leader Peter C. Breen.No one was happy about the bill, the Lombard Republican told his colleagues at the tail end of an hourlong debate Monday over the measure. Not House Republicans. Not House Democrats. None of the other caucuses in the legislature.But that’s what compromises look like, he said — it’s “a sign that the bill has actually hit that sweet, middle spot.&rdquo …