[tz] Summer time for Brasil needed in tzdatabase

Greetings, According to this site: http://pcdsh01.on.br/DecHV.html http://pcdsh01.on.br/FusoBR_HVCorrente.htm

From the 2012-10-21 until 2013-02-17 the Brazilian Estates will be using summer time. For example: the zone America/Sao_Paulo in the tzdata2012g says -3:00 and should be -2:00. Thanks!

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