Notes on text widget:

The text widget is a hacked up entry widget.  Much of the entry man page
applies, with the following changes and additions:

added the following options to configure:

	-height			requested height of the widget (in lines)
	-xscrollcommand		updates horizontal scrollbar
	-yscrollcommand		updates vertical scrollbar
	-wrapmode		one of none, char, word or fixed.
				fixed means wrap on characters based on the
				user supplied width even if the width of the
				window changes.

added following widget commands:

	yview			takes a lines number as argument.
				positions line at the top of the window.
	xview			takes an integer which specifies a
				horizontal offset.  Used for horizontal
				scrolling.  Units are 1/8 of the width of
				a tab (there is a logical reason for this,
				I think).
	edit			takes a variety of editing commands.
				(incomplete)

other changes:

	the @ option for mapping the pointer to a text position takes both
	x and y coordinates as @x,y

known problems:

	there is one case where word wrapping doesn't work exactly right.

	could reclaim some memory when lines are shortened.

	the cursor isn't always on the right line.

	selecting to the bottom of the window will pick up the next line.

Additional notes for version 2.0:

	Horizontal scrolling now works.

	Scanning now works.

	Incorporated bug fixes from Sean Levy.

	The scroll command parameter names have changed to be
	consistent with tk 2.0.

	The viewline widget command option has been renamed yview, also
	for consistency.