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.
This is for supporting tagging software collections (SC), if you have
installed meta package of SC then then name of package is different.
I.e. if you are tagging rubygem-foo package and you have ruby193-build
installed then the name of package is ruby193-rubygem-foo.
This adds a new option, changelog_format, which allows specifying the
full format of generated changelog entries. This also deprecates use
of changelog_with_email, since it is a subset of a fully-customizable
changelog format.
