Revert "Backport some obvious fixes for the core from Bacula 7."

This reverts commit 56560ce54e594c6bdd33c6f0fcc6210a96d6811c.
set Maintainer to pkg-bareos-devel

also set Joerg Steffens and myself as uploaders
set Vcs-* headers to the proper GitHub repository and branch

Using these, tracker.debian.org will show proper links to the repository
and tools like debcheckout will be able to fetch the source from git.
threre is no libfastlz-dev in Debian, do not Build-Depend on it

this should be kept debian-specific
set source format to 3.0 quilt

this may break the way OBS/nightlies are built, so probably it should
stay debian-specific for now
add initial changelog entry