+ + new option to pause before continuing to the signing step,
+ thanks Christof Douma (Closes: #316129).
+ + create unique attachment filenames, thanks Robin H. Johnson
+ (Closes: #318469).
+ + let caff import keys from file, thanks Jon Åslund (Closes: #318744).
+ + Improve diagnosis if caff can't read answers from STDIN, like
+ when people use xargs (Closes: #319519).