- improvements to KIWIAnalyse:
  + added functions to create a diff of changed configuration files
    all config files are checked against the rpm database and if they
    have changed the original packages are downloaded and a diff of
    them is created. The original config files are stored in the cache
    to prevent another download of the packages at next invocation.
    The result is stored in the file 'changed_config.diff'
- Added xz compression support for initrd
  * by default gzip compression is in use but you can
    switch on xz compression with the following entry
    in the .kiwirc file

    our $IrdZipper = "xz"
- eliminate the use of which in boot code
  * which is an extra tool, it was packages, splitted, dropped
    and is handled differently in the pool of distributions.
    Instead type -p provided as shell builtin is used