TradMusician's ABC music

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- fixed bug: instrument midi selection was not working (Thanks Gary Morris)
- fixed bug: external SD cards were not seen as writable (Thanks Stephen Yale)
-fixed bug: midi generation failed when tune contained chord with added bass (Thanks Robert Deom)
- can now favorite a tune opened from a file if the file is indexed in the library (Thanks Bryn Sowash)
- now prevents online tunebook editing
- displays online tunebook as file path instead of real path in library