- obsolete cron sub package on systemd machines

- use %license

- dropped non suse support
- added etckeeper-set-package-manager.patch: set the package
manager via a patch now that we only care about suse
- bzr support:
- disable for now as it would force the whole package to be
python2 bound. you can reenable it when building with
--with=bzr or set the options in your prjconf:
%define _with_bzr 1
Macros:
%_with_bzr 1
:Macros
- change bzr support to be in a subpackage if enabled
- build with python3 when not building with bzr support
- patch shebang line in the zypper plugin to match that
- build the whole package as noarch if we don't build with python
as we are just packaging a bunch of shell scripts
- move bash completion to a sub package, which is recommended to
keep the default working, BR and Require the bash-completion
package for path ownership
- downgrade to git-core so we only have the minimal git for small
installs on servers
- no longer build the cron support on systemd machines. the systemd
timer is more powerful and should be used instead.
- when uninstalling we should also disable and stop the systemd
timer
- only ship the documentation files that are also shipped in the