adding a new puzzle.
[originally from svn r6189]
- in the Unix `make install' section at the bottom.
Add it to list.c so that the OS X binary will be able to select it
-from the menus.
+from the menus. (Also, double-check that the game structure name in
+the source file has been renamed from `nullgame'. Actually compiling
+it on OS X would be a good way to check this, if convenient.)
Add a documentation section in puzzles.but.