code: public static boolean isLasDatabase( ASpatialDb db ) throws Exception {
          if (!db.hasTable(TABLENAME) || !db.hasTable(LasCellsTable.TABLENAME)) {
              return false;
          }
          return true;
      }
docs: Checks if the db is a las database readable by HortonMachine.
  
  @param db the database to check.
  @return <code>true</code> if the db can be read.
  @throws Exception