various bugfixes/updates

unlock system now supports clear and failed extra stages
songs unlocked by roulette are no longer unlocked by selecting them as extra stage
'fixed' survived time for extra stage when failing

stepmania/src/UnlockSystem.cpp

@@ -46,6 +46,10 @@ UnlockSystem::UnlockSystem()
 
 void UnlockSystem::RouletteUnlock( const Song *song )
 {
+	// if its an extra stage, don't count it
+	if (GAMESTATE->IsExtraStage() || GAMESTATE->IsExtraStage2())
+		return;
+
 	SongEntry *p = FindSong( song );
 	if (!p)
 		return;  // does not exist