TODO:
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* Guitar Chords Tab integration
* Better control over the 1st and 2nd chord inversions (Less random, less jumping)
* Chord left-hand patterns (ballad etc)
* (even) better melody generation: Markov chain prediction.
* Melody phrasing option. 
* Syllable count option.


12-12-2017
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+ New tab: Guitar
+ Import error handling, useful for working with PyScripter.
- Code cleanup


30-11-2017
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+ Layout adjustment
+ Draw MIDI Button is now visible on all tabs
+ Somewhat better melody generation, not complete yet.
- Code cleanup.