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Collect Version Information from Different Packages
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$Id$

  >>> from cybertools.util.version import versions

  >>> versions.add()

  >>> v = versions.get('cybertools.util.version')
  >>> v
  cybertools.util.version 0.4-3005
  >>> print v
  0.4-3005
  >>> v.short
  '0.4'

  >>> v = versions.get('foo')
  >>> v
  foo 0.0-0000
  >>> print v
  0.0-0000