Version 1.6

Due to my carelessness I uploaded the version 1.5 package with the old
version 1.4 newwad.exe. To avoid confusion I have renamed the fixed 
package 1.6.

BspView will now view hexen2 demo bsp's with the hexen palette if you
use the /hexen switch. I don't have the full version yet, so I don't 
know if it works with that.

A big bug with the treatment of fullbright colours has been fixed. 
There was a situation where fullbrights could be produced in a 
sub-texture when none existed in the parent and vice-versa.