Banner: add tag to release, add more space.

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  | Welcome to ROOT 6.00/00                http://root.cern.ch |
  |                               (c) 1995-2014, The ROOT Team |
  | Built for linuxx8664gcc                                    |
  | From tag v6-00-00, 30 May 2014                             |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q' |
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  | Welcome to ROOT 5.99/06                    http://root.cern.ch |
  |                                   (c) 1995-2014, The ROOT Team |
  | Built for macosx64                                             |
  | From heads/master@v5-99-06-934-g611d387, May 28 2014, 11:52:20 |
  | Try '.help', '.demo', '.license', '.credits', '.quit'/'.q'     |
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