Merge pull request #296 from PeterBjuhr/master

Improvements on the musicxml import dialog
po.setup.current always returns a value
Merge branch 'master' of github.com:wbsoft/frescobaldi
nl typo
make the largest part of p&c generic
move textedit url parsing to its own small module
oops
nl po corr
oops2
add debug.modules()