Implement RADAR_NUM_HANDS result.

Change hold note contents to rows (from beats).  This makes it
consistent with tap note data.  Row numbers are also generally
more precise, since they're integers, not floats.

stepmania/src/NotesLoaderKSF.cpp

@@ -184,8 +184,8 @@ bool KSFLoader::LoadFromKSFFile( const CString &sPath, Steps &out, const Song &s
 			{
 				HoldNote hn (
 					t, /* button */
-					iHoldStartRow[t]/(float)iTickCount, /* start */
-					(r-1)/(float)iTickCount /* end */
+					BeatToNoteRow(iHoldStartRow[t]/(float)iTickCount), /* start */
+					BeatToNoteRow((r-1)/(float)iTickCount) /* end */
 				);
 				notedata.AddHoldNote( hn );
 				iHoldStartRow[t] = -1;