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The IM_ERASEFRAME method instructs an image confined to a given rectangle
to erase itself.  Normally this method is used to erase an image drawn
using the IM_DRAWFRAME method.  This method expects the following

    struct impErase
        ULONG MethodID;
        struct RastPort *imp_RPort;
            WORD X;
            WORD Y;
        } imp_Offset;

        /* these parameters only valid for IM_ERASEFRAME */
            WORD Width;
            WORD Height;
        } imp_Dimensions;

The mytextlabelclass example blindly passes this method on to its
superclass.  The superclass treats IM_ERASEFRAME just like IM_ERASE.

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