SIGNIFICANT CHANGES IN rsnapshot-ng

Deleted all docbook stuff - it's been unmaintained for some time
Deleted redhat stuff - not germane to this project
Deleted generated manpages - shouldn't be in version control,
  as they're generated from something else that's already in version
  control!
Deleted autoconf stuff - switching to CPAN-stylee
Added copy of XML::Tiny - to use in new-style config parser
