Consistent measure comments with internals.

For some time, we had the text file use // measure 1
when it was measure 0 internally.

As usual, revert if this is a bad idea. It's just bugging me.

src/NoteDataUtil.cpp

@@ -367,7 +367,7 @@ void NoteDataUtil::GetSMNoteDataString( const NoteData &in, RString &sRet )
 		{
 			if( m )
 				sRet.append( 1, ',' );
-			sRet += ssprintf("  // measure %d\n", m+1);
+			sRet += ssprintf("  // measure %d\n", m);
 
 			NoteType nt = GetSmallestNoteTypeForMeasure( *nd, m );
 			int iRowSpacing;