Keep track of played and passed songs separately; it's too much

of a hassle to try to derive one from the other.

stepmania/src/StageStats.cpp

@@ -45,6 +45,7 @@ void StageStats::operator+=( const StageStats& other )
 			fRadarActual[p][r] += other.fRadarActual[p][r];
 		}
 		fSecondsBeforeFail[p] += other.fSecondsBeforeFail[p];
+		iSongsPlayed[p] += other.iSongsPlayed[p];
 		iSongsPassed[p] += other.iSongsPassed[p];
 	}
 }

stepmania/src/StageStats.h

@@ -37,7 +37,9 @@ struct StageStats
 	float	fRadarPossible[NUM_PLAYERS][NUM_RADAR_CATEGORIES];	// filled in by ScreenGameplay on start of notes
 	float	fRadarActual[NUM_PLAYERS][NUM_RADAR_CATEGORIES];	// filled in by ScreenGameplay on start of notes
 	float	fSecondsBeforeFail[NUM_PLAYERS];				// -1 means didn't/hasn't failed
-	int		iSongsPassed[NUM_PLAYERS];						// For course, this is the number of songs that the player has passed
+	/* The number of songs played and passed, respectively. */
+	int		iSongsPassed[NUM_PLAYERS];
+	int		iSongsPlayed[NUM_PLAYERS];
 };