[w3m-dev 03456] tiling of tab

* display.c (displayBuffer): use LastTab->y
	(redrawNLine): fix column calculation
* fm.h (TabBuffer): add x1, x2, y
* main.c (calcTabPos): added
	(main): calcTabPos()
	(mouse_scroll_line): rewrite
	(process_mouse): use LastTab->y
	(_newT): calcTabPos()
	(calcTabPos): added
	(deleteTab): calcTabPos()
	(moveTab): calcTabPos()
From: Hironori SAKAMOTO <hsaka@mth.biglobe.ne.jp>

fm.h

@@ -1,4 +1,4 @@
-/* $Id: fm.h,v 1.85 2002/11/21 16:31:36 ukai Exp $ */
+/* $Id: fm.h,v 1.86 2002/11/21 17:05:01 ukai Exp $ */
 /* 
  * w3m: WWW wo Miru utility
  * 
@@ -452,6 +452,9 @@ typedef struct _TabBuffer {
     struct _TabBuffer *prevTab;
     Buffer *currentBuffer;
     Buffer *firstBuffer;
+    short x1;
+    short x2;
+    short y;
 } TabBuffer;
 
 typedef struct _DownloadList {