You won’t ever see a much happier crowd than the hundreds of nattily dressed people who sat in sunny Plummer Park late last month, celebrating a victory of a sort. The people were home health-care workers, and they were hearing our governor, Gray Davis, exultantly proclaiming how he was bringing them into the gladsome realm of the decently waged and benefited.Davis saluted the people who have long been handling the home personal-care needs of the elderly and otherwise convalescent. It‘s a hard job, a messy job and, as of now, a minimum-wage-plus-peanuts job, minus any health benefits.