document environment variable EDITOR for tagger
document DEBUG environment variable
document KojiReleaser and do not mark it as experimental any more
various enhancement to man pages
mark spacewalk.releng namespace as obsolete

I done s/spacewalk.releng./tito./ in spacewalk.git, but it may reside in some (private) branches.
So let keep it for little bit more releases, but print warnings.
mark build.py.props as obsolete
Merge pull request #77 from xsuchy/pull-req-obsolete

mark spacewalk.releng.* and build.py.props as obsolete
Merge pull request #76 from xsuchy/pull-req-man1

various enhancement to documentation
Automatic commit of package [tito] release [0.4.12-1].