Fix fret ruler extension parsing scales

extensions/fablabchemnitz/fret_ruler/scales/cet55.scl

@@ -0,0 +1,56 @@
+! cet55.scl
+!
+51th root of 5
+ 51
+!
+ 54.63360
+ 109.26720
+ 163.90081
+ 218.53441
+ 273.16801
+ 327.80161
+ 382.43522
+ 437.06882
+ 491.70242
+ 546.33602
+ 600.96962
+ 655.60323
+ 710.23683
+ 764.87043
+ 819.50403
+ 874.13764
+ 928.77124
+ 983.40484
+ 1038.03844
+ 1092.67204
+ 1147.30565
+ 1201.93925
+ 1256.57285
+ 1311.20645
+ 1365.84006
+ 1420.47366
+ 1475.10726
+ 1529.74086
+ 1584.37446
+ 1639.00807
+ 1693.64167
+ 1748.27527
+ 1802.90887
+ 1857.54248
+ 1912.17608
+ 1966.80968
+ 2021.44328
+ 2076.07688
+ 2130.71049
+ 2185.34409
+ 2239.97769
+ 2294.61129
+ 2349.24490
+ 2403.87850
+ 2458.51210
+ 2513.14570
+ 2567.77930
+ 2622.41291
+ 2677.04651
+ 2731.68011
+ 5/1