Merge pull request #430 from PeterBjuhr/musicxml

Avoid python crash mentioned in issue #331
pot; some nl updates
fr update
Merge pull request #433 from philmassart/master

fr update
fr upd
nl tr upd
Include a Keywords entry in desktop file
Merge pull request #440 from ryanakca/master

Include a Keywords entry in desktop file
highlight Scheme vector properly
Merge branch 'master' of github.com:wbsoft/frescobaldi
fix AttributeError: 'ScoreWizard' object has no attribute 'showInsertDialog'
fix UnicodeDecodeError
release 2.0.16
start making all imports side-effect free
make import icons side-effect free
even make toplevel side-effect free
version bump to 2.17-dev, we drop out the zero
some more modules side-effect free
some more side-effect free imports
new function app.oninit to call a function on QApplication instantiation or directly when qApp already exists