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name            werabox  --  Erase box with attribute

synopsis        VOID werabox(number,up_r,up_c,lo_r,lo_c,attr);
                COUNT number;           window number
                COUNT up_r,up_c;        upper row and column
                COUNT lo_r,lo_c;        lower row and column
                COUNT attr;             attribute or -1 for default

description  Erases a box (or block) of the screen to attribute.
           If -1 is specified for attribute then
           winfo[number].bg_at is used. If window is off (woff)
           will turn window on (won).
           This function can be called but programmer should
           call erabox() or xerabox().