by Mark McDermott When the Manhattan Beach Unified School district last proposed school bonds, nearly a decade ago, the pitch was easily digestible, because Measures C and EE included funding for gleaming new athletic facilities at Mira Costa High School and a sparkling new music room at the middle school. The pitch for Measure RLS is a bit more nuanced and a lot less shiny. The proposed bond measure, which will be on the ballot for the November 5 election,…