T2G_VESA - A program to convert a text screen into a graphics screen

After writing the 16 color version of this program, I decided that I really
did want a 400 line version, so that the graphics screen would be identical
to the text screen.  I figured that since everybody has an SVGA card now,
I would use a VESA mode instead of playing around with the VGA registers.
I did this for 2 reasons: 1) I'm lazy and 2) I figured it was much safer to
use a standard mode which will work on every machine (that supports that
mode) instead of a tweaked mode which just might blow up someone's monitor.

It's basically the same as the VGA version, except that the graphics mode
is VESA 640x400x256 instead of EGA/VGA 640x350x16 and it draws using the
16 line character set instead of the 14 line character set.  Note that your
machine must support the VESA interface for this program to work.
