Support for using arabic numerals to indicate fret number

[Aeyk]

I notice that there is a commented out line to switch the numbering system form Roman Numerals to Arabic Numerals.

jtab/javascripts/jtab.js

Line 625 in fa1a352

// var fret_labels = [ '', '1fr', '2fr', '3fr', '4fr', '5fr', '6fr', '7fr', '8fr', '9fr', '10fr', '11fr', '12fr', '13fr', '14fr', '15fr', '16fr', '17fr', '18fr', '19fr', '20fr', '21fr', '' ];

What would be needed for this to be a 'configurable option'? Something like a data-attribute on the #jtab element which could be read by jTab to decide which numbering system to use?