The ranchers, environmental nonprofits and park service officials attempting to settle a lawsuit demanding an end to commercial agriculture in the Point Reyes National Seashore have once again extended their negotiations. They were due to give a progress report to U.S. District Court Judge Maxine M. Chesney last Friday but have pushed off the update until Oct. 18. “Mediation continues and has been productive, so we have extended the date for our next case management…