Make Decathlon ROMs always use all 4 directions on a joystick.

This is necessary, since the original controller was meant to be
track & field controller with two buttons, which map to left/right
on an Atari.

Changes.txt

@@ -12,6 +12,17 @@
                                Release History
 ===========================================================================
 
+5.0 to 5.0.1: (xxxx yy, 2017)
+
+  * Various 'Bumper Bash' and 'Decathlon' ROMs are marked as always having
+    all 4 directions on a joystick enabled, since they can't be played
+    properly otherwise.
+
+  * Added 'Hunchy II' from Chris Walton (cd-w) to ROM properties database.
+
+-Have fun!
+
+
 4.7.3 to 5.0: (July 16, 2017)
 
   * Note: because of major TIA/6502/RIOT changes, the state file format
@@ -185,8 +196,6 @@
     compiler versions, and fixed compile issues on AArch64 and ppc64le
     architectures.
 
--Have fun!
-
 
 4.7.2 to 4.7.3: (Nov. 21, 2016)
 

src/emucore/Console.cxx

@@ -183,10 +183,18 @@ Console::Console(OSystem& osystem, unique_ptr<Cartridge>& cart,
     myConsoleTiming = ConsoleTiming::secam;
   }
 
-  // Bumper Bash always requires all 4 directions
+  // Bumper Bash and Decathlon always require all 4 directions
   // Other ROMs can use it if the setting is enabled
-  bool joyallow4 = md5 == "aa1c41f86ec44c0a44eb64c332ce08af" ||
+  // Hopefully this list should stay short
-                   md5 == "1bf503c724001b09be79c515ecfcbd03" ||
+  // If it starts to get too long, we should add a ROM properties entry
+  bool joyallow4 = md5 == "aa1c41f86ec44c0a44eb64c332ce08af" || // Bumper Bash
+                   md5 == "16ee443c990215f61f7dd1e55a0d2256" || // Bumper Bash (PAL)
+                   md5 == "1bf503c724001b09be79c515ecfcbd03" || // Bumper Bash (Unknown)
+                   md5 == "ac7c2260378975614192ca2bc3d20e0b" || // Decathlon
+                   md5 == "883258dcd68cefc6cd4d40b1185116dc" || // Decathlon (PAL)
+                   md5 == "ede4ab11ca346bd023b2c21d941e0c50" || // Decathlon (SECAM)
+                   md5 == "525f2dfc8b21b0186cff2568e0509bfc" || // Decathlon [fixed]
+                   md5 == "bf52327c2197d9d2c4544be053caded1" || // Decathlon (HES)
                    myOSystem.settings().getBool("joyallow4");
   myOSystem.eventHandler().allowAllDirections(joyallow4);