* w3mimgdisplay.c (clearMargin): added (GetOption): add -margin (ClearImage): clear margin * w3mi,g/w3mimg.h (w3mimg_op): clear_margin * w3mimg/fb/fb.c (fb_clear): x,y must be >= 0 * w3mimg/x11/x11_w3mimg.c (x11_clear): x,y must be >= 0 From: Hiroyuki Ito <hito@crl.go.jp>