Do not show the alert about merge tracks.
Change the keyboard help image.
Change the label of control buttons.
Change key binds.
Add a parameter 'source' to read annotations from.
Update dependencies.
Set the default value of prefix the empty string.
Extract a module 'SpanConfig'.
Refactor the SpanAdjuster module.
Show details of an error.
Bug fix: key bindings.
Create the distribution for release 4.1.5.