w3m tab browsing

Default keybindings:

NEW_TAB		T	open new tab, clone current page
TAB_LINK	C-t	open document refered by link in a new tab
			Num(N) + TAB_LINK will open in Nth tab
CLOSE_TAB	C-q	close current tab
			Num(N) + CLOSE_TAB will close Nth tab
NEXT_TAB	}	change to next tab
			Num(N) + NEXT_TAB will change to Nth next tab
PREV_TAB	{	change to prev tab
			Num(N) + PREV_TAB will change to Nth prev tab
TAB_MENU	ESC-T	open tab selection menu
			operation in tab selection menu is same as operation 
			in buffer selection menu

No default keybinding for the following functions:

TAB_GOTO		open URL in a new tab
			Num(N) + TAB_GOTO will open in Nth tab
TAB_GOTO_RELATIVE	open relative URL in a new tab
			Num(N) + TAB_GOTO_RELATIVE will open in Nth tab
TAB_RIGHT		move current tab to right
			Num(N) + TAB_RIGHT will move current tab to N right
TAB_LEFT		move current tab to left
			Num(N) + TAB_LEFT will move current tab to N left

You can operate with mouse:

left button		move the tab if you click on the tab
			dragging a tab to another tab will move tab
			dragging a link to tab will open the link in the tab
			clicking on right upper 'x' will current tab
middle button		close the tab if you clink on the tab
right button		open menu as usual

Options:

open_tab_blank		open new tab if target is _blank or _new
			default: OFF
close_tab_back		close the tab when you back from last buffer in the tab
			default: OFF (= Can't go back...)
