Gov. Jerry Brown has never described it quite this way, but the essence of what he wants to do with many of the new tax dollars from last fall’s Proposition 30 is finish the job begun in 1971 by the Serrano v. Priest decision of the California Supreme Court. “Equal treatment for children in unequal situations is not justice,” Brown said as he proposed giving school districts with high concentrations of English-learners, subsidized-lunch students and foster children as much as $5,000 per year over several years for each such student they have, in addition to the “base grant” of $6,800 …