Forecaster: The South Portland Planning Board on Tuesday endorsed a 180-day extension of the moratorium on tar sands developments, which is set to expire May 5. The board approved the extension 4-0, with Rob Schreiber and Erick Giles absent. The City Council sent the extension to the board after it approved a first reading March 17. The extension now goes back to the council on April 23 for a second and final reading. The city has been under the tar sands moratorium retroactively since last fall. For the...