Build and install the NetHack.ad file, and change the nethack.sh to append
the HACKDIR to the XUSERFILESEARCHPATH. This means users do not have to
do anything special to use the NetHack X11 resources, nor does it require
teaching nethack where the X11 app-defaults directory is. The change also
updates the X11 and linux doc files in a corresponding way.
In some X11R6 configurations, .Xresources is the name for the .Xdefaults
file. My older Linux system uses _both_, depending on which window
manager you run.
- change the way the tile sizes are calculated, based on the image size,
so non-square tiles can once again be supported.
- fix Gnome port so it can actually display non-square tiles, several
height/width uses were backwards
- update Install.X11 to note the number of tiles per row in the XPM image
