update rconfig to 0.30

0.28: - Use netname() when running fping etc. Reject duplicate hostnames.
        Problem noted by alan.
0.29: - Add ${fqdn} to the list of available keys in dirtrees.
      - Allow 'key -= value' to remove values from key settings
      - When '-d' is specified display the final state of the configuration
      - If dirtrees is assigned with '=', disable the 'insert after ${type}'
        behaviour for any subsequent 'distrees +=' option
0.30: - completely rework parsing of rdist

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