* avoid generating a blank part for font size that do not have extras
* use “stretch” instead of “jessie”
.. and add libgtest-dev.
* keep space width equal 4, no matter what
* updated generated fonts
* updated reference images
* Replace PyQt completely (#5902)
* ported img2lbm.py to Pillow (and get rid of PyQt)
* removed PyQt from Dockerfile
* fixed travis
* fixed issue with img2lbm and Horus bitmaps