* contrib/server-side/svnmirror.sh

    + added DUMPPARAMS to specify the params for the svnadmin dump call
    + added note about svnadmin 1.1 and "--deltas" cmdline option
    * made the script POSIX sh-compatible
      (zsh in native-mode does not work atm!)
    * changed handling of default settings
    * created config file has all lines commented out now
    + check if necessary values are set
    + added note about current users
    * fixed documentation in the default config