activate debian release numbers on OBS

Debian has no separate field for release numbers,
only version numbers.
Mostly, the release number is added to the version number,
separated by a "-".
OBS has a feature to auto-increment release numbers for RPM packages.
Our modified OBS also enables this feature for DEB packages.
travis: set hostname to localhost to prevent problems with name resolution
travis: bugfix
add dependency for libfastlz
Show right info in status slots.

Slot should not be empty but show the correct loaded volume info and
not the first slot after the drive in the enumeration.

Fixes #159: Display Error in bconsole for status slots; did not show empty slot after load
Tweak text.
Return right returnvalue on import/export/move cmd.

We were always returning 0 (e.g. operation failed) for
the import/export/move commands. This makes any runscript fail
any next runscript and the Job also fails.

Fixes #146: Variable "Job Exit Code" in mailcommand reports always
            "Error" when doing copy or migration job
Fixes #155: runafterjob doesn't get executed if a runscript directive is
            placed before the directive runafterjob
Try to fix nextpool overide via runcmd.

Fixes #160: Job overwrite "nextpool" in run command in bconsole doesn't work
use single changelog file

Signed-off-by: Marco van Wieringen <marco.van.wieringen@bareos.com>