thanks Christof Douma (Closes: #316129).
+ create unique attachment filenames, thanks Robin H. Johnson
(Closes: #318469).
- + improve error when using xargs, thanks Lior Kaplan (Closes: #319519).
+ let caff import keys from file, thanks Jon Åslund (Closes: #318744).
* Depend on libtext-template-perl as caff needs it.
* Update to Standards-Version 3.6.2, no changes necessary.