Visually combines pairs of notes across a bar line in a single cumulative note value.

Used in early music, usually together with mensurstrich.
Hide ledger lines
Notes merged into value of previous measure should not combine their hook/beam with following chord beam.
Re-synch with other commits
Align to latest commits
Align with recent re-factoring.
Re-align with other devlopment
Added Harmony view to the Object Debugger
Make header visible and set column widths
Remove obsolete case for Harmony
default soundfonts are only filenames
Merge pull request #300 from softins/harmony-debugger

 Added Harmony view to the Object Debugger
add better UI to edit soundfont and sfz paths
implement repitch mode
add blank preferences for default soundfont
extend search: entering p5 moves to page 5
avoid loading a sf twice in zerberus
hide backup file on Windows
fix audio export for zerberus; fix progress bar
add store/recall global synthesizer settings; connect tuning settings