Clean up `qtopensesame.py`
- `str` to `unicode`
- Remove unused `restart()` function
- Migrate to new-style config API
Remove deprecated code
- logfile_codec
- compensation
- coordinates
Do not clean up the experiment before saving unsaved changes.
Also fixes #124.
Replace Droid Sans Hebrew by Alef
Merge remote-tracking branch 'upstream/playground' into playground