Empty strings

This is an alternative to your modification in 4fa392f59c78cf5dce6b38f8a28eb40f97b394be

I prefer empty non-translatable strings over redundant ones. I did it like this in the subsequent mode description and obviously missed that one in my original commit.l
make cups command list available
add public shell_split() function
printer command and fallback raster printing resolution configurable, needs to be tested
Merge pull request #217 from uliska/patch-1

Empty strings
nl.pomo
Merge branch 'master' of github.com:wbsoft/frescobaldi
be nice and import Qt in debug mode