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name            box  --  Draw a box

synopsis        c = box(up,lf,lo,rt,type,attr);
                COUNT c;       Not meaningful
                COUNT up,lf;   Upper left corner of box
                COUNT lo,rt;   Lower right corner of box
                COUNT type;    Type of box {0,1,2}
                COUNT attr;    Attribute to print box

description  This function prints a box described by
           up,lf and lo,rt with attribute attr on
           the screen or on the current window. if
           upper row = lower row a line is drawn or
           lower left = upper right a column