Only slide duplicate difficulties when loading BMS files; in other cases,

just move the duplicates to EDIT.  This should fix the common glitch
of users with eg. two beginner steps for a song having all difficulties
bumped up; instead, just move the extra step to an edit.

stepmania/src/NotesLoaderBMS.h

@@ -5,13 +5,16 @@
 #include "Steps.h"
 #include "NotesLoader.h"
 
-class BMSLoader: public NotesLoader {
+class BMSLoader: public NotesLoader
+{
 	bool LoadFromBMSFile( const CString &sPath, Steps &out1 );
 	void mapBMSTrackToDanceNote( int iBMSTrack, int &iDanceColOut, char &cNoteCharOut );
 	void PushTrackNumForMagic( int iTrackNum );
 	StepsType CheckTracksMagic( void );
 	void ResetTracksMagic( void );
 
+	void SlideDuplicateDifficulties( Song &p );
+
 public:
 	void GetApplicableFiles( CString sPath, CStringArray &out );
 	bool LoadFromDir( CString sDir, Song &out );