par2cmdline: update to 0.6.11 and adopt it

[Bjørn: break overlong longDescription line]
bup: update to 0.26 and adopt it

[Bjørn: use patchShebangs to unbreak chroot build (fixes up references
to /usr/bin/env {python,bash}]
journal-mailer: add version 0.1.1.0
journal-mailer: camelCasify attribute name