Added data object and factory for sediment load calculation. The factory provides two methods to get sediment load data: The first is to get an array of loads for a specific range at a river, these loads contain the time and description. The second is to get a single sediment load with time, description and data values.

CLASS
    NAME "POLYGON_BARRIERS"
    STYLE
        SIZE 5
        OUTLINECOLOR "#FF8000"
    END
END