fix stale Steps* in Trail being used after reverting songs from disk

stepmania/src/Profile.cpp

@@ -288,7 +288,6 @@ int Profile::GetPossibleCourseDancePointsForStepsType( StepsType st ) const
 	int iTotal = 0;
 
 	// add course high scores
-	{
 	vector<Course*> vCourses;
 	SONGMAN->GetAllCourses( vCourses, false );
 	for( unsigned i=0; i<vCourses.size(); i++ )
@@ -309,7 +308,6 @@ int Profile::GetPossibleCourseDancePointsForStepsType( StepsType st ) const
 			iTotal += ScoreKeeperMAX2::GetPossibleDancePoints( fRadars );
 		}
 	}
-	}
 
 	return iTotal;
 }

stepmania/src/ScreenGameplay.cpp

@@ -1804,6 +1804,13 @@ void RevertChanges( void* papSongsQueue )
 	vector<Song*>& apSongsQueue = *(vector<Song*>*)papSongsQueue;
 	for( unsigned i=0; i<apSongsQueue.size(); i++ )
 		apSongsQueue[i]->RevertFromDisk();
+
+	// We need to regen any Courses that have any of the songs we just reloaded.
+	// Regen all Courses for now.
+	vector<Course*> vpAllCourses;
+	SONGMAN->GetAllCourses( vpAllCourses, true );
+	FOREACH( Course*, vpAllCourses, pCourse )
+		(*pCourse)->RegenTrails();
 }
 
 void ScreenGameplay::ShowSavePrompt( ScreenMessage SM_SendWhenDone )

stepmania/src/StageStats.h

@@ -14,7 +14,8 @@ class Steps;
 
 struct StageStats
 {
-	StageStats();
+	StageStats() { Init(); }
+	void Init();
 	void AddStats( const StageStats& other );		// accumulate
 	Grade GetGrade( PlayerNumber pn ) const;
 	bool OnePassed() const;