A plan that was supposed to serve as a comprehensive roadmap for the Delta through the year 2100 now must be partially rewritten, after a judge this week ruled on complaints stemming from no fewer than seven lawsuits.The “Delta Plan,” as the document is known, had been challenged by players on multiple sides of California’s water battle — by environmentalists, by Delta farmers, and by Southern California water users who rely on the Delta for a portion of their water supply.