Summary
- use "Isabelle DejaVu" fonts uniformly: Text Area, GUI elements, HTML output etc.;
- more shell functions;
- proper superscript "-1", based on "Deja Vu Sans Condensed" U+207b/U+00b9, with bold version via "Change Weight / Embolden by 80 em units";
- spontaneous update of .sfd files due to fontforge;
- clarified module name (again);