Log Message:
Update to 3.23.4 (from 3.22.2). From the changelog:

- fix F9 listing user lesson files
- toneincontext: let the user compare and practise when answering wrong
- toneincontext: remove Give up button
- port exporting exercises to audio files and creating ear training test
  printouts to python3/gtk3
- download ALSA: reload moved to importlib
- toneincontext: select between number and solfa buttons
- toneincontext in minor: ask for correct tones
- toneincontext: clear flashbar after we give up
- toneincontext: statistics for x last question
- .solfegerc: sort sections and variable on save
- toneincontext: let the user set the tempo
- Fix bug #48079: label for interval accels
- Bug fixes to ExceptionDialog
- More python3 fixes, encoding
- Removed deprecated modules: chord and harmonicprogressiondictation
- Bugfix: search:modulename
- Handle lesson files where the module is not found
- idproperty: define horiz and vertic. They were missing
- uuid.py: removed. We don't use it any more
- Flashbar: bug in display caused warnings
- Removed support for some very old (8 years) file locations
- Tweaks and fixes to the exercise view
- TracebackWindows: added Clear button
- import of user exercise modules now works
- Ctrl-F in search view should scroll to top and grab focus
- Some changes from deprecated to new gtk api
- Added --run-lessonfile command line option
- Added Track.__add__
- Bugfix to lesson file header default value handling
- Front page editor bugfixes
- Modernize toneincontext module. Not finished yet.
- Port to Python 3