known issues

- normal beamer columns have wrong leftmargin, columns with multicols
  work just fine
- global theme option is called institute, should be faculty
- real institute support missing
- stuve support missing
- tableofcontents still needs frame-wrapper bc functionality to call
  language depended title is currently unknown
- most beamer functionality (like setbeamercolor or setbeamerfont) is
  applicable, but not everything, users can still break stuff