Bug#499514: Recommending cups-bsd is not a full fix

[Benjamin Mesing <bensmail@gmx.net>]

IMO merely recommending cups-bsd is not a full fix: If one has lpr
installed, cups-bsd won't be installed alongside cups-bsd. As long as
okular _silently_ fails to print in some configurations I would not
consider this bug solved. A simple solution would be to check, if
cupsbsd is available upon printing and inform the user if not.
(Btw. shouldn't lpr from the cupsbsd and the lpr package share a common
interface?)

Best regards

Benjamin