Added a new game, `Rectangles', taken from nikoli.co.jp.

[originally from svn r4206]

.cvsignore

@@ -1,5 +1,5 @@
 Makefile*
-net cube fifteen sixteen nullgame
+net cube fifteen sixteen rect nullgame
 *.exe *.obj *.o
 *.map *.rsp
 *notes

Recipe

@@ -20,11 +20,13 @@ net      : [X] gtk COMMON NET
 cube     : [X] gtk COMMON cube
 fifteen  : [X] gtk COMMON fifteen
 sixteen  : [X] gtk COMMON sixteen
+rect     : [X] gtk COMMON rect
 
 net      : [G] WINDOWS COMMON NET
 cube     : [G] WINDOWS COMMON cube
 fifteen  : [G] WINDOWS COMMON fifteen
 sixteen  : [G] WINDOWS COMMON sixteen
+rect     : [G] WINDOWS COMMON rect
 
 # The `nullgame' source file is a largely blank one, which contains
 # all the correct function definitions to compile and link, but