Fix fret ruler extension parsing scales

extensions/fablabchemnitz/fret_ruler/scales/cet21k.scl

@@ -0,0 +1,61 @@
+! cet21k.scl
+!
+scale of syntonic comma's, almost 56-tET                                        
+ 56
+!
+ 81/80
+ 6561/6400
+ 531441/512000
+ 43046721/40960000
+ 107.53145
+ 129.03774
+ 150.54403
+ 172.05032
+ 193.55661
+ 215.06290
+ 236.56919
+ 258.07548
+ 279.58176
+ 301.08805
+ 322.59434
+ 344.10063
+ 365.60692
+ 387.11321
+ 408.61950
+ 430.12579
+ 451.63208
+ 473.13837
+ 494.64466
+ 516.15095
+ 537.65724
+ 559.16353
+ 580.66982
+ 602.17611
+ 623.68240
+ 645.18869
+ 666.69498
+ 688.20127
+ 709.70756
+ 731.21385
+ 752.72014
+ 774.22643
+ 795.73272
+ 817.23900
+ 838.74529
+ 860.25158
+ 881.75787
+ 903.26416
+ 924.77045
+ 946.27674
+ 967.78303
+ 989.28932
+ 1010.79561
+ 1032.30190
+ 1053.80819
+ 1075.31448
+ 1096.82077
+ 1118.32706
+ 1139.83335
+ 1161.33964
+ 1182.84593
+ 1204.35222