separate the backslash+newline things out of the *.opt files, logically not 100% clean, but better as it is not generated content anyway (keeping the one-liners in there for now, even though more consistent would be shifting them out as well)
cf. http://blog.cmpxchg8b.com/2013/08/security-debianisms.html
(in preparation of doing something real with set ±p)