8 new 4-note-chord tests

14 4-note-chords left
18 5-note chords left

4-note-chords added now:
Major 7th
Major 7th Augmented 5th
Major 7th Flattened 5th
Sixth
Major flat 6
Half Diminished 7th
Fully Diminished 7th
Some files were deleted and re-created