They’re incredibly grumpy about it (and who wouldn’t be?) but “scolding and grumbling about the past and expressing doubt about the future,” Miami-Dade commissioners voted to approve a plan to finish the Miami-Dade Performing Arts Center — 20 months late and $67.7 million over budget. Said one commissioner: “I feel like an abused wife who isn’t leaving a relationship even though she still may be abused in the future.”